Add production WSGI server - Flask dev server unsuitable for production load

This adds a complete production deployment setup using Gunicorn as the WSGI server, replacing Flask's development server.

Key components:
- Gunicorn configuration with optimized worker settings
- Support for sync, threaded, and async (gevent) workers
- Automatic worker recycling to prevent memory leaks
- Increased timeouts for audio processing
- Production-ready logging and monitoring

Deployment options:
1. Docker/Docker Compose for containerized deployment
2. Systemd service for traditional deployment
3. Nginx reverse proxy configuration
4. SSL/TLS support

Production features:
- wsgi.py entry point for WSGI servers
- gunicorn_config.py with production settings
- Dockerfile with multi-stage build
- docker-compose.yml with full stack (Redis, PostgreSQL)
- nginx.conf with caching and security headers
- systemd service with security hardening
- deploy.sh automated deployment script

Configuration:
- .env.production template with all settings
- Support for environment-based configuration
- Separate requirements-prod.txt
- Prometheus metrics endpoint (/metrics)

Monitoring:
- Health check endpoints for liveness/readiness
- Prometheus-compatible metrics
- Structured logging
- Memory usage tracking
- Request counting

Security:
- Non-root user in Docker
- Systemd security restrictions
- Nginx security headers
- File permission hardening
- Resource limits

Documentation:
- Comprehensive PRODUCTION_DEPLOYMENT.md
- Scaling strategies
- Performance tuning guide
- Troubleshooting section

Also fixed memory_manager.py GC stats collection error.

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

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

wsgi.py

@@ -0,0 +1,34 @@
+#!/usr/bin/env python3
+"""
+WSGI entry point for production deployment
+"""
+import os
+import sys
+from pathlib import Path
+
+# Add the project directory to the Python path
+project_root = Path(__file__).parent.absolute()
+sys.path.insert(0, str(project_root))
+
+# Set production environment
+os.environ['FLASK_ENV'] = 'production'
+
+# Import and configure the Flask app
+from app import app
+
+# Production configuration overrides
+app.config.update(
+    DEBUG=False,
+    TESTING=False,
+    # Ensure proper secret key is set in production
+    SECRET_KEY=os.environ.get('SECRET_KEY', app.config.get('SECRET_KEY'))
+)
+
+# Create the WSGI application
+application = app
+
+if __name__ == '__main__':
+    # This is only for development/testing
+    # In production, use: gunicorn wsgi:application
+    print("Warning: Running WSGI directly. Use a proper WSGI server in production!")
+    application.run(host='0.0.0.0', port=5005)