Fix pydantic_settings import error

- Add pydantic-settings to requirements.txt
- Add fallback import for BaseSettings from pydantic if pydantic_settings is not available
- Fix ModuleNotFoundError during database migration

app/core/config.py

@@ -1,6 +1,11 @@
 from pathlib import Path
 
-from pydantic_settings import BaseSettings
+# Try to import BaseSettings from pydantic_settings (for Pydantic v2+)
+# Fall back to importing from pydantic directly (for Pydantic v1)
+try:
+    from pydantic_settings import BaseSettings
+except ImportError:
+    from pydantic import BaseSettings
 
 
 class Settings(BaseSettings):

requirements.txt

@@ -2,6 +2,7 @@ fastapi>=0.100.0
 uvicorn>=0.23.0
 sqlalchemy>=2.0.0
 pydantic>=2.0.0
+pydantic-settings>=2.0.0
 alembic>=1.11.0
 python-dotenv>=1.0.0
 ruff>=0.0.272