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>

app/core/lifespan.py

@@ -15,11 +15,13 @@ from fastapi import FastAPI
 from sqlalchemy import text
 
 from middleware.auth import AuthManager
-# Remove this import if not needed: from models.database.base import Base
 
 from .database import SessionLocal, engine
 from .logging import setup_logging
 
+# Remove this import if not needed: from models.database.base import Base
+
+
 logger = logging.getLogger(__name__)
 auth_manager = AuthManager()
 
@@ -46,7 +48,9 @@ def check_database_ready():
     try:
         with engine.connect() as conn:
             # Try to query a table that should exist
-            result = conn.execute(text("SELECT name FROM sqlite_master WHERE type='table' LIMIT 1"))
+            result = conn.execute(
+                text("SELECT name FROM sqlite_master WHERE type='table' LIMIT 1")
+            )
             tables = result.fetchall()
             return len(tables) > 0
     except Exception:
@@ -93,6 +97,7 @@ def verify_startup_requirements():
     logger.info("[OK] Startup verification passed")
     return True
 
+
 # You can call this in your main.py if desired:
 # if not verify_startup_requirements():
 #     raise RuntimeError("Application startup requirements not met")