refactor

src/dependencies.py

@@ -7,21 +7,22 @@ from src.adapter.jwt import JWT, JWTPayload
 from src.config import settings
 from src.usecase import Usecase
 
-_usecase_template: Usecase | None = None
-
-security = HTTPBearer()
+_usecase_instance: Usecase | None = None  # Singleton
 
 
 def set_usecase(usecase: Usecase) -> None:
-    global _usecase_template
-    _usecase_template = usecase
+    global _usecase_instance
+    _usecase_instance = usecase
 
 
 def get_usecase() -> Usecase:
-    if _usecase_template is None:
+    if _usecase_instance is None:
         raise RuntimeError('Usecase not initialized. Call set_usecase() first')
 
-    return _usecase_template
+    return _usecase_instance
+
+
+security = HTTPBearer()
 
 
 def get_current_user(credentials: Annotated[HTTPAuthorizationCredentials, Depends(security)]) -> JWTPayload: