finish the main code

app/main.py

@@ -0,0 +1,22 @@
+from fastapi import FastAPI
+from fastapi.staticfiles import StaticFiles
+from fastapi.responses import FileResponse
+from app.routers import nodes, pods, metrics
+
+app = FastAPI(title="k3s Health Dashboard")
+
+app.include_router(nodes.router)
+app.include_router(pods.router)
+app.include_router(metrics.router)
+
+app.mount("/static", StaticFiles(directory="dashboard/static"), name="static")
+
+
+@app.get("/")
+def serve_ui():
+    return FileResponse("dashboard/index.html")
+
+
+@app.get("/health")
+def health():
+    return {"status": "ok"}