Initial scaffold: React+TS+Vite frontend, FastAPI backend, config system

backend/main.py

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+import logging
+from contextlib import asynccontextmanager
+from pathlib import Path
+
+from fastapi import FastAPI
+from fastapi.staticfiles import StaticFiles
+from fastapi.responses import FileResponse
+
+from config import load_config
+from mqtt_bridge import start_mqtt
+from routes.config_routes import router as config_router
+from routes.ws_routes import router as ws_router
+
+logging.basicConfig(level=logging.INFO, format="%(asctime)s %(levelname)s %(name)s: %(message)s")
+logger = logging.getLogger(__name__)
+
+FRONTEND_DIR = Path(__file__).parent.parent / "frontend" / "dist"
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    config = load_config()
+    logger.info(f"Loaded config: {config.title} with {len(config.cameras)} cameras")
+    start_mqtt()
+    yield
+
+
+app = FastAPI(title="Camera Viewer", lifespan=lifespan)
+
+app.include_router(config_router)
+app.include_router(ws_router)
+
+# Serve frontend static files
+if FRONTEND_DIR.exists():
+    app.mount("/assets", StaticFiles(directory=FRONTEND_DIR / "assets"), name="assets")
+
+    @app.get("/{full_path:path}")
+    async def serve_frontend(full_path: str):
+        # Try to serve the exact file first
+        file_path = FRONTEND_DIR / full_path
+        if full_path and file_path.exists() and file_path.is_file():
+            return FileResponse(file_path)
+        # Fall back to index.html for SPA routing
+        return FileResponse(FRONTEND_DIR / "index.html")