feat: Implement asset soft deletion with S3 file purging, enhance type safety, and improve error handling in generation and adapter services.

api/endpoints/admin.py

@@ -23,7 +23,7 @@ async def get_current_user(token: Annotated[str, Depends(oauth2_scheme)], repo:
     )
     try:
         payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
-        username: str = payload.get("sub")
+        username: str | None = payload.get("sub")
         if username is None:
             raise credentials_exception
     except JWTError: