✨ feat: Implement Resumable Generation Jobs with SSE Support

- Introduced GenerationJobManager to handle resumable LLM generation jobs independently of HTTP connections.
- Added support for subscribing to ongoing generation jobs via SSE, allowing clients to reconnect and receive updates without losing progress.
- Enhanced existing agent controllers and routes to integrate resumable functionality, including job creation, completion, and error handling.
- Updated client-side hooks to manage adaptive SSE streams, switching between standard and resumable modes based on user settings.
- Added UI components and settings for enabling/disabling resumable streams, improving user experience during unstable connections.

api/server/index.js

@@ -16,6 +16,7 @@ const {
   performStartupChecks,
   handleJsonParseError,
   initializeFileStorage,
+  GenerationJobManager,
 } = require('@librechat/api');
 const { connectDb, indexSync } = require('~/db');
 const initializeOAuthReconnectManager = require('./services/initializeOAuthReconnectManager');
@@ -192,6 +193,7 @@ const startServer = async () => {
     await initializeMCPs();
     await initializeOAuthReconnectManager();
     await checkMigrations();
+    GenerationJobManager.initialize();
   });
 };