style: fix linting issues and remove unused imports

- Remove unused imports from all modified files
- Fix flake8 violations (unused variables, f-strings without placeholders)
- Apply Black formatting consistently
- Shorten long line in google_drive.py

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

app/api/common.py

@@ -1,11 +1,11 @@
 """
 Common utilities for API routes
 """
+
 import logging
 import os
 from pathlib import Path
-from sqlalchemy.orm import Session
-from fastapi import Depends, HTTPException, status
+from fastapi import HTTPException, status
 
 from app.database import SessionLocal
 from app.config import settings
@@ -13,6 +13,7 @@ from app.config import settings
 # Set up logging
 logger = logging.getLogger(__name__)
 
+
 def get_db():
     """Database dependency injection for routes"""
     db = SessionLocal()
@@ -21,22 +22,23 @@ def get_db():
     finally:
         db.close()
 
+
 def resolve_file_path(file_path: str, subfolder: str = None) -> str:
     """
     Resolves a file path to an absolute path with path traversal protection.
     If the path is not absolute, it will be joined with the workdir path.
     Optionally, can include a subfolder like 'processed'.
-    
+
     Security: Validates that the resolved path stays within the workdir
     to prevent path traversal attacks (e.g., ../../etc/passwd).
-    
+
     Args:
         file_path: The file path to resolve
         subfolder: Optional subfolder within workdir
-        
+
     Returns:
         The validated absolute file path
-        
+
     Raises:
         HTTPException: If the path attempts to escape the workdir
     """
@@ -45,13 +47,13 @@ def resolve_file_path(file_path: str, subfolder: str = None) -> str:
         base_dir = Path(settings.workdir) / subfolder
     else:
         base_dir = Path(settings.workdir)
-    
+
     # Resolve the file path
     if not os.path.isabs(file_path):
         resolved_path = (base_dir / file_path).resolve()
     else:
         resolved_path = Path(file_path).resolve()
-    
+
     # Ensure the resolved path is within the base directory (path traversal protection)
     try:
         resolved_path.relative_to(base_dir.resolve())
@@ -59,8 +61,7 @@ def resolve_file_path(file_path: str, subfolder: str = None) -> str:
         # Path is outside the base directory - potential path traversal attack
         logger.warning(f"Path traversal attempt detected: {file_path} -> {resolved_path}")
         raise HTTPException(
-            status_code=status.HTTP_400_BAD_REQUEST,
-            detail="Invalid file path: path traversal not allowed"
+            status_code=status.HTTP_400_BAD_REQUEST, detail="Invalid file path: path traversal not allowed"
         )
-    
+
     return str(resolved_path)