fix: Add staging URLs to CORS origins

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/app/main.py

@@ -166,8 +166,10 @@ app.add_middleware(
         "http://localhost:3000",
         "http://127.0.0.1:3000",
         "http://localhost:8000",
-        "http://192.168.0.202:3000",  # Local network
-        "https://autonetsellcar.com",  # Production
+        "http://192.168.0.202:3000",  # Production
+        "http://192.168.0.202:3001",  # Staging
+        "http://192.168.0.202:8001",  # Staging backend
+        "https://autonetsellcar.com",  # Production domain
         "http://autonetsellcar.com",   # Production (HTTP redirect)
     ],
     allow_credentials=True,