refactor: Simplify repository classes by inheriting from BaseRepository and removing redundant methods

app/repositories/base.py

@@ -38,7 +38,7 @@ class BaseRepository(Generic[ModelType]):
 
         """
         try:
-            statement = select(self.model).where(getattr(self.model, "id") == entity_id)
+            statement = select(self.model).where(self.model.id == entity_id)
             result = await self.session.exec(statement)
             return result.first()
         except Exception:
@@ -129,4 +129,4 @@ class BaseRepository(Generic[ModelType]):
         except Exception:
             await self.session.rollback()
             logger.exception("Failed to delete %s", self.model.__name__)
-            raise
+            raise