Prevent duplicate router registration

Co-authored-by: Copilot <[email protected]>

Author: ramonechen

app/main.py

@@ -15,7 +15,7 @@ def scan_and_include_routers(app: FastAPI) -> None:
         module = importlib.import_module(f"{package_module_name}.{module_name}")
         for attr_name in dir(module):
             attr = getattr(module, attr_name)
-            if isinstance(attr, APIRouter):
+            if isinstance(attr, APIRouter) and getattr(attr, "__module__", None) == module.__name__:
                 app.include_router(attr)