fix(i-d): ai/sessions-API-Bruche behoben — tote Frontend-Calls eliminiert statt Backend-Shims

Root-Cause: Backend hat KEIN /ai/sessions-CRUD (nur Conversations-Routen im kommunikation/ai_assistant). Frontend-Nutzer war NUR AISidebar — dessen Chat-Tab renderte nie einen echten Chat sondern nur Platzhalter gesteuert von Session-Calls auf 404. Nach AGENTS.md 0.2/0.3 keine Backend-Shims gebaut: (1) Geister-Tests ChatWindow.test.tsx + SessionList.test.tsx geloescht — importierten nicht existierende Komponenten @/components/ai/ChatWindow + SessionList (BUG-099-Muster, Plan sanktioniert Loeschung). (2) AISidebar: tote fetchSessions/createSession-Calls + sessionId/loading-State entfernt; Chat-Tab zeigt jetzt Verweis-Link auf existierende /ai-assistant-Seite (962e0ee). (3) api/ai.ts 253→170 Zeilen: tote Interfaces ChatFolder/ChatSession/ChatMessage/ChatAttachment + Folders/Sessions/Attachments-Sektionen entfernt; fetchMessages/streamChat bleiben (genutzt von AiChatPanel/Communication).

Beweise: tsc --noEmit exit=0; vitest src/__tests__/ai/ 26/26 gruen (vorher 2 Geister-Suites mit Import-Error); ruff unberuehrt.

frontend/src/__tests__/ai/ChatWindow.test.tsx

@@ -1,113 +0,0 @@
-import React from 'react';
-import { describe, it, expect, vi, beforeEach } from 'vitest';
-import { render, screen, fireEvent, waitFor } from '@testing-library/react';
-import { ChatWindow } from '@/components/ai/ChatWindow';
-
-const mockMessages = [
-  { id: 'm1', session_id: 's1', role: 'user', content: 'Hello AI', tokens: 10, model_used: '' },
-  { id: 'm2', session_id: 's1', role: 'assistant', content: 'Hello User', tokens: 10, model_used: 'gpt-4' },
-];
-
-const fetchMessagesMock = vi.fn();
-const fetchAttachmentsMock = vi.fn();
-const streamChatMock = vi.fn();
-const uploadAttachmentMock = vi.fn();
-
-vi.mock('@/api/ai', () => ({
-  fetchMessages: (...args: any[]) => fetchMessagesMock(...args),
-  fetchAttachments: (...args: any[]) => fetchAttachmentsMock(...args),
-  streamChat: (...args: any[]) => streamChatMock(...args),
-  uploadAttachment: (...args: any[]) => uploadAttachmentMock(...args),
-  getAttachmentDownloadUrl: (id: string) => `/api/v1/ai/attachments/${id}/download`,
-}));
-
-vi.mock('react-markdown', () => ({
-  default: ({ children }: { children: string }) => <div>{children}</div>,
-}));
-
-vi.mock('remark-gfm', () => ({
-  default: () => ({}),
-}));
-
-beforeEach(() => {
-  vi.clearAllMocks();
-  fetchMessagesMock.mockResolvedValue(mockMessages);
-  fetchAttachmentsMock.mockResolvedValue([]);
-  streamChatMock.mockReturnValue({
-    async *[Symbol.asyncIterator]() {
-      yield { type: 'token', content: 'Hi' };
-      yield { type: 'done' };
-    },
-  });
-});
-
-describe('ChatWindow', () => {
-  it('renders chat window with messages', async () => {
-    render(<ChatWindow sessionId="s1" />);
-    await waitFor(() => {
-      expect(screen.getByText('Hello AI')).toBeInTheDocument();
-      expect(screen.getByText('Hello User')).toBeInTheDocument();
-    });
-  });
-
-  it('renders textarea input for message', async () => {
-    render(<ChatWindow sessionId="s1" />);
-    await waitFor(() => {
-      expect(screen.getByPlaceholderText('Nachricht eingeben...')).toBeInTheDocument();
-    });
-  });
-
-  it('renders send button', async () => {
-    render(<ChatWindow sessionId="s1" />);
-    await waitFor(() => {
-      expect(screen.getByText('Senden')).toBeInTheDocument();
-    });
-  });
-
-  it('disables send button when input is empty', async () => {
-    render(<ChatWindow sessionId="s1" />);
-    await waitFor(() => {
-      const sendBtn = screen.getByText('Senden');
-      expect(sendBtn).toBeDisabled();
-    });
-  });
-
-  it('enables send button when input has text', async () => {
-    render(<ChatWindow sessionId="s1" />);
-    await waitFor(() => {
-      expect(screen.getByPlaceholderText('Nachricht eingeben...')).toBeInTheDocument();
-    });
-    const input = screen.getByPlaceholderText('Nachricht eingeben...');
-    fireEvent.change(input, { target: { value: 'Test message' } });
-    expect(screen.getByText('Senden')).not.toBeDisabled();
-  });
-
-  it('shows empty state when no messages', async () => {
-    fetchMessagesMock.mockResolvedValueOnce([]);
-    render(<ChatWindow sessionId="s1" />);
-    await waitFor(() => {
-      expect(screen.getByText('Starte eine Konversation...')).toBeInTheDocument();
-    });
-  });
-
-  it('displays error when fetchMessages fails', async () => {
-    fetchMessagesMock.mockRejectedValueOnce(new Error('Load failed'));
-    render(<ChatWindow sessionId="s1" />);
-    await waitFor(() => {
-      expect(screen.getByText('Load failed')).toBeInTheDocument();
-    });
-  });
-
-  it('sends message on button click', async () => {
-    render(<ChatWindow sessionId="s1" />);
-    await waitFor(() => {
-      expect(screen.getByPlaceholderText('Nachricht eingeben...')).toBeInTheDocument();
-    });
-    const input = screen.getByPlaceholderText('Nachricht eingeben...');
-    fireEvent.change(input, { target: { value: 'Test message' } });
-    fireEvent.click(screen.getByText('Senden'));
-    await waitFor(() => {
-      expect(streamChatMock).toHaveBeenCalledWith('s1', 'Test message', undefined);
-    });
-  });
-});

frontend/src/__tests__/ai/SessionList.test.tsx

@@ -1,104 +0,0 @@
-import React from 'react';
-import { describe, it, expect, vi, beforeEach } from 'vitest';
-import { render, screen, fireEvent, waitFor } from '@testing-library/react';
-import { QueryClient, QueryClientProvider } from '@tanstack/react-query';
-import { SessionList } from '@/components/ai/SessionList';
-
-const queryClient = new QueryClient({
-  defaultOptions: { queries: { retry: false } },
-});
-
-function renderWithProvider(ui: React.ReactElement) {
-  return render(
-    <QueryClientProvider client={queryClient}>{ui}</QueryClientProvider>
-  );
-}
-
-const mockSessions = [
-  { id: 's1', title: 'First Chat', folder_id: null, agent_id: null, is_sidebar: false, created_at: '2024-01-01T00:00:00Z', updated_at: '2024-01-01T00:00:00Z' },
-  { id: 's2', title: 'Second Chat', folder_id: 'f1', agent_id: null, is_sidebar: false, created_at: '2024-01-01T00:00:00Z', updated_at: '2024-01-01T00:00:00Z' },
-];
-
-const mockFolders = [
-  { id: 'f1', name: 'My Folder', parent_id: null, created_at: '2024-01-01T00:00:00Z' },
-];
-
-const fetchSessionsMock = vi.fn();
-const fetchFoldersMock = vi.fn();
-const createSessionMock = vi.fn();
-const deleteSessionMock = vi.fn();
-const updateSessionMock = vi.fn();
-const createFolderMock = vi.fn();
-const deleteFolderMock = vi.fn();
-const updateFolderMock = vi.fn();
-
-vi.mock('@/api/ai', () => ({
-  fetchSessions: (...args: any[]) => fetchSessionsMock(...args),
-  fetchFolders: (...args: any[]) => fetchFoldersMock(...args),
-  createSession: (...args: any[]) => createSessionMock(...args),
-  deleteSession: (...args: any[]) => deleteSessionMock(...args),
-  updateSession: (...args: any[]) => updateSessionMock(...args),
-  createFolder: (...args: any[]) => createFolderMock(...args),
-  deleteFolder: (...args: any[]) => deleteFolderMock(...args),
-  updateFolder: (...args: any[]) => updateFolderMock(...args),
-}));
-
-beforeEach(() => {
-  vi.clearAllMocks();
-  fetchSessionsMock.mockResolvedValue(mockSessions);
-  fetchFoldersMock.mockResolvedValue(mockFolders);
-  createSessionMock.mockResolvedValue({ id: 's3', title: 'New Chat', folder_id: null, agent_id: null, is_sidebar: false, created_at: '', updated_at: '' });
-  deleteSessionMock.mockResolvedValue({});
-  updateSessionMock.mockResolvedValue({});
-  createFolderMock.mockResolvedValue({ id: 'f2', name: 'New Folder', parent_id: null, created_at: '' });
-  deleteFolderMock.mockResolvedValue({});
-  updateFolderMock.mockResolvedValue({});
-});
-
-describe('SessionList', () => {
-  it('renders session list with sessions', async () => {
-    renderWithProvider(<SessionList activeSessionId="s1" onSelectSession={vi.fn()} />);
-    await waitFor(() => {
-      expect(screen.getByText('First Chat')).toBeInTheDocument();
-    });
-  });
-
-  it('renders folder names', async () => {
-    renderWithProvider(<SessionList activeSessionId="s1" onSelectSession={vi.fn()} />);
-    await waitFor(() => {
-      expect(screen.getByText('My Folder')).toBeInTheDocument();
-    });
-  });
-
-  it('renders sessions inside folders', async () => {
-    renderWithProvider(<SessionList activeSessionId="s1" onSelectSession={vi.fn()} />);
-    await waitFor(() => {
-      expect(screen.getByText('Second Chat')).toBeInTheDocument();
-    });
-  });
-
-  it('calls onSelectSession when session clicked', async () => {
-    const onSelect = vi.fn();
-    renderWithProvider(<SessionList activeSessionId={null} onSelectSession={onSelect} />);
-    await waitFor(() => {
-      expect(screen.getByText('First Chat')).toBeInTheDocument();
-    });
-    fireEvent.click(screen.getByText('First Chat'));
-    expect(onSelect).toHaveBeenCalledWith('s1');
-  });
-
-  it('shows loading state initially', () => {
-    fetchSessionsMock.mockReturnValue(new Promise(() => {}));
-    fetchFoldersMock.mockReturnValue(new Promise(() => {}));
-    renderWithProvider(<SessionList activeSessionId={null} onSelectSession={vi.fn()} />);
-    expect(screen.getByText('Laden...')).toBeInTheDocument();
-  });
-
-  it('displays error when fetch fails', async () => {
-    fetchSessionsMock.mockRejectedValueOnce(new Error('Failed to load'));
-    renderWithProvider(<SessionList activeSessionId={null} onSelectSession={vi.fn()} />);
-    await waitFor(() => {
-      expect(screen.getByText('Failed to load')).toBeInTheDocument();
-    });
-  });
-});

frontend/src/api/ai.ts

@@ -61,47 +61,6 @@ export interface AIAgent {
   updated_at?: string;
 }
 
-export interface ChatFolder {
-  id: string;
-  name: string;
-  parent_id: string | null;
-  user_id: string;
-  created_at?: string;
-}
-
-export interface ChatSession {
-  id: string;
-  user_id: string;
-  agent_id: string | null;
-  title: string;
-  is_pinned: boolean;
-  is_sidebar: boolean;
-  folder_id: string | null;
-  created_at?: string;
-  updated_at?: string;
-}
-
-export interface ChatMessage {
-  id: string;
-  session_id: string;
-  role: string;
-  content: string;
-  tool_calls?: Record<string, unknown>[];
-  tool_results?: Record<string, unknown>[];
-  tokens: number;
-  model_used: string;
-  created_at?: string;
-}
-
-export interface ChatAttachment {
-  id: string;
-  message_id: string | null;
-  session_id: string;
-  filename: string;
-  mime_type: string;
-  size_bytes: number;
-}
-
 export interface AITool {
   name: string;
   description: string;
@@ -147,53 +106,11 @@ export const fetchTools = async () => {
   return Array.isArray(res) ? res : res.items ?? [];
 };
 
-// ─── Folders ───
-
-export const fetchFolders = () => apiGet<ChatFolder[]>('/ai/folders');
-export const createFolder = (data: { name: string; parent_id?: string }) => apiPost<ChatFolder>('/ai/folders', data);
-export const updateFolder = (id: string, data: Partial<ChatFolder>) => apiPut<ChatFolder>(`/ai/folders/${id}`, data);
-export const deleteFolder = (id: string) => apiDelete(`/ai/folders/${id}`);
-
-// ─── Sessions ───
-
-export const fetchSessions = (isSidebar?: boolean) =>
-  apiGet<ChatSession[]>('/ai/sessions', { params: isSidebar !== undefined ? { is_sidebar: isSidebar } : {} });
-export const createSession = (data: { title?: string; agent_id?: string; is_sidebar?: boolean; folder_id?: string }) =>
-  apiPost<ChatSession>('/ai/sessions', data);
-export const updateSession = (id: string, data: Partial<ChatSession>) =>
-  apiPut<ChatSession>(`/ai/sessions/${id}`, data);
-export const deleteSession = (id: string) => apiDelete(`/ai/sessions/${id}`);
-
 // ─── Messages ───
 
 export const fetchMessages = (conversationId: string) =>
   apiGet<{ role: string; content: string }[]>(`/ai/conversations/${conversationId}/messages`);
 
-// ─── Attachments ───
-
-export const fetchAttachments = (sessionId: string) =>
-  apiGet<ChatAttachment[]>(`/ai/sessions/${sessionId}/attachments`);
-
-export async function uploadAttachment(sessionId: string, file: File): Promise<ChatAttachment> {
-  const formData = new FormData();
-  formData.append('file', file);
-  const csrfToken = sessionStorage.getItem('leocrm_csrf_token');
-  const response = await fetch(`/api/v1/ai/sessions/${sessionId}/attachments`, {
-    method: 'POST',
-    headers: {
-      ...(csrfToken ? { 'X-CSRF-Token': csrfToken } : {}),
-    },
-    credentials: 'include',
-    body: formData,
-  });
-  if (!response.ok) throw new Error(`Upload failed: ${response.status}`);
-  return response.json();
-}
-
-export function getAttachmentDownloadUrl(attachmentId: string): string {
-  return `/api/v1/ai/attachments/${attachmentId}/download`;
-}
-
 // ─── Streaming Chat ───
 
 export interface StreamEvent {

frontend/src/components/layout/AISidebar.tsx

@@ -1,9 +1,9 @@
-import React, { useState, useEffect } from 'react';
+import React from 'react';
+import { Link } from 'react-router-dom';
 
 import { ResizablePanel } from '@/components/ui/ResizablePanel';
 import { SuggestionList } from '@/components/ai/SuggestionSidebar';
 import { ImprovementPanel } from '@/components/ai/ImprovementPanel';
-import { createSession, fetchSessions } from '@/api/ai';
 import { useUIStore } from '@/store/uiStore';
 import { getContributedTabs } from './sidebarTabs';
 import { useTranslation } from 'react-i18next';
@@ -56,26 +56,6 @@ function ChatPanel() {
 export function AISidebar() {
   const { t } = useTranslation();
   const { aiSidebarCollapsed, toggleAISidebar, aiSidebarTab, setAISidebarTab, notifications, removeNotification } = useUIStore();
-  const [sessionId, setSessionId] = useState<string | null>(null);
-  const [loading, setLoading] = useState(true);
-
-  useEffect(() => {
-    (async () => {
-      try {
-        const sessions = await fetchSessions(true);
-        if (sessions.length > 0) {
-          setSessionId(sessions[0].id);
-        } else {
-          const session = await createSession({ is_sidebar: true, title: 'Sidebar Chat' });
-          setSessionId(session.id);
-        }
-      } catch (e) {
-        console.error('AISidebar init error:', e);
-      } finally {
-        setLoading(false);
-      }
-    })();
-  }, []);
 
   const tabs: TabDef[] = [
     { key: 'chat', label: 'KI Chat', icon: robotIcon, testId: 'ai-sidebar-tab-chat' },
@@ -166,18 +146,18 @@ export function AISidebar() {
       const ContributedComponent = contributed.component;
       return <ContributedComponent />;
     }
-    // chat tab
+    // chat tab — voller KI-Chat lebt auf der /ai-assistant-Seite
-    if (loading) {
-      return (
-        <div className="flex items-center justify-center h-full text-sm text-secondary-400">Laden...</div>
-      );
-    }
-    if (sessionId) {
-      return <div className="flex items-center justify-center h-full text-secondary-400 text-sm">KI Chat im Kommunikations-Plugin verfügbar</div>;
-    }
     return (
-      <div className="flex items-center justify-center h-full text-sm text-red-500">
+      <div className="flex flex-col items-center justify-center h-full text-center px-4 gap-3">
-        Session konnte nicht erstellt werden
+        <p className="text-sm text-secondary-500">
+          Der volle KI-Chat ist auf der AI-Assistant-Seite verfügbar.
+        </p>
+        <Link
+          to="/ai-assistant"
+          className="inline-flex items-center px-4 py-2 rounded-md bg-primary-600 text-white text-sm font-medium hover:bg-primary-700 focus:outline-none focus-visible:ring-2 focus-visible:ring-primary-500 min-h-touch"
+        >
+          AI Assistant öffnen
+        </Link>
       </div>
     );
   };