fix(state-hub): fix mcp-http startup crash and remove legacy tunnel targets

- Add `Optional` to typing imports in mcp_server/server.py — it was used
  in 13 annotations but never imported, crashing FastMCP v3 at startup
- Remove legacy tunnel/tunnel-daemon/tunnel-loop/tunnel-status/tunnel-stop
  targets from Makefile; ops-bridge (tunnels-up/status/check) supersedes them

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

mcp_server/server.py

@@ -11,7 +11,7 @@ import re
 import sys
 from datetime import datetime, timezone
 from pathlib import Path
-from typing import Any
+from typing import Any, Optional
 from uuid import UUID
 
 import httpx