feat: RFCP MVP deployed on VPS

Iteration 1:
- Dark theme with 3-way toggle
- Dynamic heatmap gradient (blue→red)
- Radius up to 100km
- Save & Calculate workflow

Iteration 2:
- Terrain overlay toggle
- Batch height operations
- Zoom-dependent heatmap rendering

Infrastructure:
- Backend FastAPI on 8888
- Frontend static build via Caddy
- Systemd services
- Caddy reverse proxy integration

backend/venv/lib/python3.12/site-packages/fastapi/cli.py

@@ -0,0 +1,13 @@
+try:
+    from fastapi_cli.cli import main as cli_main
+
+except ImportError:  # pragma: no cover
+    cli_main = None  # type: ignore
+
+
+def main() -> None:
+    if not cli_main:  # type: ignore[truthy-function]
+        message = 'To use the fastapi command, please install "fastapi[standard]":\n\n\tpip install "fastapi[standard]"\n'
+        print(message)
+        raise RuntimeError(message)  # noqa: B904
+    cli_main()