v4 Schritt 3: 'Verbinden'-Tab (Orchestrierung)

- routers/integration.py: GET /api/integration/test ruft Engine /v1/models -> ok + Modell-Liste.
- connect.js: Verbindungstest-Button, Bild/Vision-Flow (erkennt Vision-Modell, sonst Cookbook-Hinweis,
  OpenAI-Vision-Snippet), Tool-Configs (OpenCode/Cline/Cursor/OpenWebUI) mit Copy.
- Nav-Eintrag 'Verbinden' + View + main.js Registrierung.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

app.py

@@ -20,7 +20,7 @@ from fastapi import FastAPI, HTTPException
 from fastapi.responses import FileResponse, JSONResponse
 from fastapi.staticfiles import StaticFiles
 
-from routers import jobs, maintenance, models, system, cookbook
+from routers import jobs, maintenance, models, system, cookbook, integration
 
 app = FastAPI(title="Mission Control")
 
@@ -41,6 +41,7 @@ app.include_router(jobs.router)
 app.include_router(maintenance.router)
 app.include_router(system.router)
 app.include_router(cookbook.router)
+app.include_router(integration.router)
 
 _STATIC = Path(__file__).parent / "static"