⬆️ Upgrade Python to 3.14 (#2352)

backend/app/core/config.py

@@ -1,6 +1,6 @@
 import secrets
 import warnings
-from typing import Annotated, Any, Literal
+from typing import Annotated, Any, Literal, Self
 
 from pydantic import (
     AnyUrl,
@@ -12,7 +12,6 @@ from pydantic import (
     model_validator,
 )
 from pydantic_settings import BaseSettings, SettingsConfigDict
-from typing_extensions import Self
 
 
 def parse_cors(v: Any) -> list[str] | str: