fix(backend): Add missing PaginatedResponse schema definition

backend/schemas.py

@@ -34,6 +34,17 @@ class Token(SQLModel):
 class TokenData(SQLModel):
     email: Optional[str] = None
 
+T = TypeVar("T")
+
+class PaginationMeta(SQLModel):
+    total: int
+    limit: int
+    offset: int
+
+class PaginatedResponse(SQLModel, Generic[T]):
+    data: List[T]
+    meta: PaginationMeta
+
 # --- Venue Schemas ---
 class VenueBase(SQLModel):
     name: str