feat(T07): KI-Copilot with OpenRouter chat, voice input, action system, chat history

backend/app/main.py

@@ -9,7 +9,7 @@ from fastapi import APIRouter, FastAPI
 from fastapi.middleware.cors import CORSMiddleware
 
 from app.config import settings
-from app.routers import auth, contacts, datev, files, ocr, sales, users, vehicles
+from app.routers import auth, contacts, copilot, datev, files, ocr, sales, users, vehicles
 
 
 @asynccontextmanager
@@ -46,6 +46,7 @@ api_v1_router.include_router(files.router)
 api_v1_router.include_router(ocr.router)
 api_v1_router.include_router(sales.router)
 api_v1_router.include_router(datev.router)
+api_v1_router.include_router(copilot.router)
 
 # Health endpoint (no auth required)
 @api_v1_router.get("/health", tags=["health"])