feat: implement OpenAI-compatible Realtime API with authentication and management features

- Added support for public Realtime API, including new routes for managing API keys and handling WebRTC connections.
- Introduced RealtimeApiKey model and associated CRUD operations for admin management of API keys.
- Implemented authentication mechanisms for API keys and client secrets.
- Enhanced environment configuration with new secrets for Realtime API.
- Created OpenAIRealtime session management and event processing for real-time interactions.
- Updated schemas and settings to accommodate new features and ensure compatibility with existing systems.

backend/app.py

@@ -44,6 +44,8 @@ from routes import (
     mcp_servers,
     model_registry,
     node_types,
+    openai_realtime,
+    realtime_api_keys,
     site_settings,
     test_cases,
     test_runs,
@@ -98,6 +100,8 @@ app.include_router(knowledge_bases.router)
 app.include_router(mcp_servers.router)
 app.include_router(model_registry.router)
 app.include_router(node_types.router)
+app.include_router(openai_realtime.router)
+app.include_router(realtime_api_keys.router)
 app.include_router(site_settings.router)
 app.include_router(test_cases.router)
 app.include_router(test_runs.router)