Add HF healthcheck routes

server.py

@@ -302,10 +302,28 @@ Higher scores = better efficiency. Be precise with your /10 ratings."""
 
 
 if FRONTEND_BUILD_DIR.exists():
-    app.mount("/assets", StaticFiles(directory=FRONTEND_BUILD_DIR / "static"), name="static")
+    app.mount("/static", StaticFiles(directory=FRONTEND_BUILD_DIR / "static"), name="static")
+
+
+@app.get("/healthz")
+@app.head("/healthz")
+async def healthcheck():
+    return {"status": "ok"}
+
+
+@app.get("/")
+@app.head("/")
+async def serve_index():
+    if not FRONTEND_BUILD_DIR.exists():
+        raise HTTPException(
+            status_code=404,
+            detail="Frontend build not found. Run the React build or deploy with the Dockerfile.",
+        )
+    return FileResponse(FRONTEND_BUILD_DIR / "index.html")
 
 
 @app.get("/{full_path:path}")
+@app.head("/{full_path:path}")
 async def serve_frontend(full_path: str):
     if not FRONTEND_BUILD_DIR.exists():
         raise HTTPException(