feat: add admin panel

examples/docker-compose.yml

@@ -24,6 +24,11 @@ services:
       # config.py declares one, so set these (or remove the agent)
       # before exposing port 8000.
     ports:
+      # /v1/messages frontend
       - "8000:8000"
+      # MCP server frontend
+      - "8001:8001"
+      # Admin UI (Phase 4.3) — change ADMIN_USER/ADMIN_PASS/SESSION_SECRET
+      - "8002:8002"
     volumes:
       - ./config.py:/config/config.py:ro