feat: add Caddy reverse proxy with auto HTTPS for LAN access and auto-derive WebSocket URL (#863)

* feat: add Caddy reverse proxy with auto HTTPS for LAN access and auto-derive WebSocket URL

Add a Caddy service to docker-compose.standalone.yml that provides automatic
HTTPS with local certificates, enabling secure access to both the frontend
and API from the local network through a single entrypoint.

Backend changes:
- Add ROOT_PATH setting to FastAPI so the API can be served under /api prefix
- Route frontend and API (/server-api) through Caddy reverse proxy

Frontend changes:
- Support WEBSOCKET_URL=auto to derive the WebSocket URL from API_URL
  automatically, using the page protocol (http→ws, https→wss) and host
- Make WEBSOCKET_URL env var optional instead of required

* style: pre-commit

* fix: make standalone compose self-contained (drop !reset dependency)

docker-compose.standalone.yml used !reset YAML tags to clear
network_mode and volumes from the base compose. !reset requires
Compose v2.24+ and breaks on Colima + brew-installed compose.

Rewrite as a fully self-contained file with all services defined
directly (server, worker, beat, redis, postgres, web, garage, cpu,
gpu-nvidia, ollama, ollama-cpu). No longer overlays docker-compose.yml.

Update setup-standalone.sh compose_cmd() to use only the standalone
file instead of both files.

* fix: update standalone docs to match self-contained compose usage

---------

Co-authored-by: Igor Loskutov <igor.loskutoff@gmail.com>

server/reflector/app.py

@@ -59,7 +59,7 @@ else:
     logger.info("Sentry disabled")
 
 # build app
-app = FastAPI(lifespan=lifespan)
+app = FastAPI(lifespan=lifespan, root_path=settings.ROOT_PATH)
 app.add_middleware(
     CORSMiddleware,
     allow_credentials=settings.CORS_ALLOW_CREDENTIALS or False,

server/reflector/settings.py

@@ -12,6 +12,8 @@ class Settings(BaseSettings):
         extra="ignore",
     )
 
+    ROOT_PATH: str = "/"
+
     # CORS
     UI_BASE_URL: str = "http://localhost:3000"
     CORS_ORIGIN: str = "*"