feat: add unified linting scripts and git hooks for code quality enforcement

- Introduced `lint` and `lint-fix` applications in `flake.nix` for unified linting of backend (Python) and frontend (TypeScript/Svelte) code.
- Added `scripts/lint.sh` for manual linting execution.
- Created `scripts/install-hooks.sh` to set up git hooks for automatic linting before commits and optional tests before pushes.
- Updated `README.md` with instructions for using the new linting features and git hooks.

backend/app/core/deps.py

@@ -1,6 +1,6 @@
 """Dependency injection utilities."""
 
-from typing import Annotated, Generator
+from typing import Annotated
 from uuid import UUID
 
 from fastapi import Depends, HTTPException, status
@@ -19,33 +19,32 @@ security = HTTPBearer()
 
 
 def get_current_user(
-    credentials: HTTPAuthorizationCredentials = Depends(security),
-    db: Session = Depends(get_db)
+    credentials: HTTPAuthorizationCredentials = Depends(security), db: Session = Depends(get_db)
 ) -> User:
     """
     Get current authenticated user from JWT token.
-    
+
     Args:
         credentials: HTTP Authorization Bearer token
         db: Database session
-        
+
     Returns:
         Current authenticated user
-        
+
     Raises:
         HTTPException: If token is invalid or user not found
     """
     # Decode token
     token = credentials.credentials
     payload = decode_access_token(token)
-    
+
     if payload is None:
         raise HTTPException(
             status_code=status.HTTP_401_UNAUTHORIZED,
             detail="Invalid authentication credentials",
             headers={"WWW-Authenticate": "Bearer"},
         )
-    
+
     # Extract user ID from token
     user_id_str: str = payload.get("sub")
     if user_id_str is None:
@@ -54,7 +53,7 @@ def get_current_user(
             detail="Invalid token payload",
             headers={"WWW-Authenticate": "Bearer"},
         )
-    
+
     try:
         user_id = UUID(user_id_str)
     except ValueError:
@@ -62,23 +61,19 @@ def get_current_user(
             status_code=status.HTTP_401_UNAUTHORIZED,
             detail="Invalid user ID in token",
             headers={"WWW-Authenticate": "Bearer"},
-        )
-    
+        ) from None
+
     # Get user from database
     user = db.query(User).filter(User.id == user_id).first()
-    
+
     if user is None:
         raise HTTPException(
             status_code=status.HTTP_401_UNAUTHORIZED,
             detail="User not found",
             headers={"WWW-Authenticate": "Bearer"},
         )
-    
-    if not user.is_active:
-        raise HTTPException(
-            status_code=status.HTTP_403_FORBIDDEN,
-            detail="User account is deactivated"
-        )
-    
-    return user
 
+    if not user.is_active:
+        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="User account is deactivated")
+
+    return user