fix(i-d): notifications-DELETE + agents/skills Brueche — tote Hooks eliminiert

Verifiziert: useDeleteNotification und useAgentSkills haben NULL Komponenten-Importeure (nur Definitionsdateien). Die echten Komponenten nutzen andere Hooks (useNotifications, useMarkNotificationRead, useUnreadNotificationCount; useAgentTools/useAgentToolsFull). Nach AGENTS.md 0.2 keine Backend-Shims fuer tote Calls: beide Hooks entfernt, ungenutztes apiDelete-Import in notifications.ts bereinigt.

Damit sind alle 12 API-Braeche aus dem D5-Triage abgeschlossen: ai/sessions x5 (3e5f13f), policies x4 (86c96f0), mail x4 (86c96f0), notifications DELETE (hier), agents/skills (hier). tsc exit=0.

frontend/src/api/automation.ts

@@ -16,7 +16,6 @@ import type {
   AutomationSettings,
   MiniAppDef,
   AgentToolInfo,
-  AgentSkillInfo,
   AgentRunFull,
 } from '@/types/automation';
 
@@ -258,16 +257,6 @@ export function useAgentToolsFull() {
   });
 }
 
-export function useAgentSkills() {
-  return useQuery({
-    queryKey: ['agentSkills'],
-    queryFn: async () => {
-      const res = await apiGet<AgentSkillInfo[] | { items: AgentSkillInfo[] }>('/agents/skills');
-      return Array.isArray(res) ? res : res.items ?? [];
-    },
-  });
-}
-
 export function useAgentRunsFull(agentId: string) {
   return useQuery({
     queryKey: ['agentRunsFull', agentId],

frontend/src/api/notifications.ts

@@ -3,7 +3,7 @@
  */
 
 import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
-import { apiGet, apiPatch, apiDelete } from './client';
+import { apiGet, apiPatch } from './client';
 import { PaginatedResponse } from './types';
 
 // ── Types matching backend schemas ──
@@ -64,16 +64,6 @@ export function useMarkNotificationRead() {
   });
 }
 
-export function useDeleteNotification() {
-  const queryClient = useQueryClient();
-  return useMutation({
-    mutationFn: (id: string) => apiDelete(`/notifications/${id}`),
-    onSuccess: () => {
-      queryClient.invalidateQueries({ queryKey: ['notifications'] });
-    },
-  });
-}
-
 export function useNotificationTypes() {
   return useQuery({
     queryKey: ['notification-types'],