fix: code formatting - Black compliance

- Fixed api/index.py formatting to comply with Black rules
- Changed single quotes to double quotes
- Added proper line spacing and formatting
- This resolves the GitHub Actions formatting check failure

Author: Neil Munoz

api/index.py

@@ -7,8 +7,10 @@
 sys.path.insert(0, str(project_root))
 
 # Set environment variables for production
-os.environ.setdefault('ENVIRONMENT', 'production')
-os.environ.setdefault('SECRET_KEY', os.environ.get('SECRET_KEY', 'vercel-production-key-change-in-env'))
+os.environ.setdefault("ENVIRONMENT", "production")
+os.environ.setdefault(
+    "SECRET_KEY", os.environ.get("SECRET_KEY", "vercel-production-key-change-in-env")
+)
 
 # Import the FastAPI app
 from app.main import app
@@ -17,19 +19,23 @@
 # If your FastAPI app is named differently, change this
 app = app
 
+
 # Optional: Add Vercel-specific middleware or configuration
 @app.middleware("http")
 async def add_vercel_headers(request, call_next):
     response = await call_next(request)
     response.headers["X-Vercel-Cache"] = "MISS"
     return response
 
+
 # Health check endpoint for Vercel
 @app.get("/api/health")
 async def health_check():
     return {"status": "healthy", "platform": "vercel", "app": "NeuroBank FastAPI"}
 
+
 # For local development
 if __name__ == "__main__":
     import uvicorn
+
     uvicorn.run(app, host="0.0.0.0", port=int(os.environ.get("PORT", 8000)))