feat: unified_search + ai_proactive plugins with Ollama Cloud DeepSeek V4

- unified_search: Hybride Suche (PostgreSQL FTS + pgvector + RRF Fusion)
  - 5 Search Providers (Contact, Company, Mail, File, Event)
  - KI Query Understanding (Fuzzy, Facetten via LiteLLM)
  - DMS Text-Extraction (PDF, DOCX, XLSX, PPTX)
  - Embedding Pipeline (ollama/nomic-embed-text, 768 Dim)
  - Background Jobs für Indexierung
  - Plugin-basierte Provider Registry

- ai_proactive: Proaktiver KI-Agent
  - Context-Tracking (Frontend → Backend → Event Bus)
  - Proactive Engine mit LLM Suggestion-Generierung
  - SSE Real-time Push an Frontend
  - 6 AI Tools für Tool Registry
  - Rate-Limiting + User Settings
  - Deep Analysis Background Jobs

- Frontend Integration:
  - useAIContext Hook, SuggestionSidebar, SuggestionBadge
  - ProactiveAISettings Page, Search API Client
  - Globale Suche auf neue API umgestellt

- Tests: test_unified_search.py + test_ai_proactive.py (alle bestanden)
- Config: Ollama Cloud DeepSeek V4 als Default, konfigurierbar
- Dependencies: PyMuPDF, python-docx, python-pptx, pgvector
- Bugfixes: notification type_key length, migration IF NOT EXISTS

app/plugins/builtins/ai_proactive/frontend/SuggestionCard.tsx

@@ -0,0 +1,94 @@
+import { useState } from 'react';
+import type { Suggestion } from './api';
+
+const typeConfig = {
+  info: { icon: '💡', color: 'blue', bg: 'bg-blue-50', border: 'border-blue-200', text: 'text-blue-700', bar: 'bg-blue-500' },
+  warning: { icon: '⚠️', color: 'orange', bg: 'bg-orange-50', border: 'border-orange-200', text: 'text-orange-700', bar: 'bg-orange-500' },
+  action: { icon: '✅', color: 'green', bg: 'bg-green-50', border: 'border-green-200', text: 'text-green-700', bar: 'bg-green-500' },
+  insight: { icon: '🔍', color: 'purple', bg: 'bg-purple-50', border: 'border-purple-200', text: 'text-purple-700', bar: 'bg-purple-500' },
+};
+
+interface SuggestionCardProps {
+  suggestion: Suggestion;
+  onDismiss: (id: string) => void;
+  onAct: (id: string, actionIndex: number) => void;
+}
+
+export function SuggestionCard({ suggestion, onDismiss, onAct }: SuggestionCardProps) {
+  const [expanded, setExpanded] = useState(false);
+  const config = typeConfig[suggestion.suggestion_type] || typeConfig.info;
+  const confidencePercent = Math.round(suggestion.confidence * 100);
+
+  return (
+    <div
+      className={`animate-slide-in ${config.bg} ${config.border} border rounded-lg p-4 mb-3 shadow-sm hover:shadow-md transition-shadow`}
+    >
+      {/* Header */}
+      <div className="flex items-start justify-between mb-2">
+        <div className="flex items-center gap-2">
+          <span className="text-lg">{config.icon}</span>
+          <h3 className={`font-semibold text-sm ${config.text}`}>{suggestion.title}</h3>
+        </div>
+        <button
+          onClick={() => onDismiss(suggestion.id)}
+          className="text-gray-400 hover:text-gray-600 transition-colors"
+          title="Ignorieren"
+        >
+          ✕
+        </button>
+      </div>
+
+      {/* Content */}
+      <p className="text-sm text-gray-600 mb-3 line-clamp-3">{suggestion.content}</p>
+
+      {/* Confidence Bar */}
+      <div className="flex items-center gap-2 mb-3">
+        <div className="flex-1 h-1.5 bg-gray-200 rounded-full overflow-hidden">
+          <div
+            className={`h-full ${config.bar} rounded-full transition-all duration-500`}
+            style={{ width: `${confidencePercent}%` }}
+          />
+        </div>
+        <span className="text-xs text-gray-500 font-mono">{confidencePercent}%</span>
+      </div>
+
+      {/* Actions */}
+      {suggestion.actions && suggestion.actions.length > 0 && (
+        <div className="space-y-2">
+          {suggestion.actions.slice(0, expanded ? undefined : 2).map((action, idx) => (
+            <button
+              key={idx}
+              onClick={() => onAct(suggestion.id, idx)}
+              disabled={suggestion.is_acted_upon}
+              className={`w-full text-left px-3 py-2 rounded-md text-xs font-medium transition-all ${
+                suggestion.is_acted_upon
+                  ? 'bg-gray-100 text-gray-400 cursor-not-allowed'
+                  : 'bg-white hover:bg-gray-50 text-gray-700 border border-gray-200 hover:border-gray-300'
+              }`}
+            >
+              <span className="font-mono text-[10px] uppercase mr-1 px-1 py-0.5 bg-gray-100 rounded">
+                {action.method}
+              </span>
+              {action.description}
+            </button>
+          ))}
+          {suggestion.actions.length > 2 && (
+            <button
+              onClick={() => setExpanded(!expanded)}
+              className="text-xs text-gray-500 hover:text-gray-700"
+            >
+              {expanded ? 'Weniger' : `${suggestion.actions.length - 2} weitere Aktionen`}
+            </button>
+          )}
+        </div>
+      )}
+
+      {/* Acted upon badge */}
+      {suggestion.is_acted_upon && (
+        <div className="mt-2 text-xs text-green-600 font-medium flex items-center gap-1">
+          ✓ Ausgeführt
+        </div>
+      )}
+    </div>
+  );
+}