refactor(proxy): move proxy logic to services.mitmproxy and update Docker service model

- Rename DockerService to DockerContainer and add folder attribute
- Move proxy-related modules (models, validator) to services.mitmproxy
- Update imports and references to new module locations
- Refactor Docker utilities to use DockerContainer and improve service discovery
- Add manager.py with create_proxy utility stub
- Initialize discovered Docker services at app startup and warn if none found

app/main.py

@@ -1,4 +1,6 @@
+import sys
 from contextlib import asynccontextmanager
+from pathlib import Path
 
 from fastapi import FastAPI
 
@@ -8,6 +10,7 @@ from core.config import settings
 from core.mongodb import close_mongodb, init_mongodb
 from core.redis import close_redis, init_redis
 from core.security import hash_password
+from integrations.docker import get_all_services
 from repositories.auth import ensure_auth_indexes, ensure_single_account
 from repositories.proxy import ensure_proxy_indexes
 
@@ -22,6 +25,18 @@ async def lifespan(_: FastAPI):
         password_hash=hash_password(settings.AUTH_PASSWORD),
     )
     await ensure_proxy_indexes()
+
+    home_dir = str(Path.home())
+    app.state.services = get_all_services(home_dir) or []
+    if not app.state.services:
+        warning = (
+                "\n" + "!" * 60 + "\n"
+                                  "  WARNING: No services found in home directory!\n"
+                                  f"  Scanned: {home_dir}\n"
+                + "!" * 60 + "\n"
+        )
+        print(warning, file=sys.stderr)
+
     try:
         yield
     finally: