style: apply black and isort formatting across entire codebase

- Standardize quote style (single to double quotes)
- Reorder and group imports alphabetically
- Fix line breaks and indentation for consistency
- Apply PEP 8 formatting standards

Also updated Makefile to exclude both venv and .venv from code quality checks.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

middleware/decorators.py

@@ -9,12 +9,14 @@ This module provides classes and functions for:
 """
 
 from functools import wraps
+
 from app.exceptions.base import RateLimitException  # Add this import
 from middleware.rate_limiter import RateLimiter
 
 # Initialize rate limiter instance
 rate_limiter = RateLimiter()
 
+
 def rate_limit(max_requests: int = 100, window_seconds: int = 3600):
     """Rate limiting decorator for FastAPI endpoints."""
 
@@ -26,10 +28,11 @@ def rate_limit(max_requests: int = 100, window_seconds: int = 3600):
             if not rate_limiter.allow_request(client_id, max_requests, window_seconds):
                 # Use custom exception instead of HTTPException
                 raise RateLimitException(
-                    message="Rate limit exceeded",
-                    retry_after=window_seconds
+                    message="Rate limit exceeded", retry_after=window_seconds
                 )
 
             return await func(*args, **kwargs)
+
         return wrapper
+
     return decorator