Fix Pydantic v2 configuration for application startup

- Added proper type annotations for DB_DIR using ClassVar[Path]
- Updated Settings class to use model_config instead of deprecated Config class
- Fixed PydanticUserError for non-annotated attributes in settings
- Application should now start properly with uvicorn

app/core/config.py

@@ -1,5 +1,6 @@
 import os
 from pathlib import Path
+from typing import ClassVar
 
 from pydantic_settings import BaseSettings
 
@@ -16,12 +17,13 @@ class Settings(BaseSettings):
     VERSION: str = "0.1.0"
 
     # SQLite Database settings
-    DB_DIR = Path("/app") / "storage" / "db"
+    DB_DIR: ClassVar[Path] = Path("/app") / "storage" / "db"
     SQLALCHEMY_DATABASE_URL: str = f"sqlite:///{DB_DIR}/db.sqlite"
 
-    class Config:
-        case_sensitive = True
-        env_file = os.path.join(BASE_DIR, ".env")
+    model_config = {
+        "case_sensitive": True,
+        "env_file": os.path.join(BASE_DIR, ".env"),
+    }
 
 
 settings = Settings()