feat: OpenRouter Support & Improve Model Fetching ⇆ (#936)

* chore(ChatGPTClient.js): add support for OpenRouter API
chore(OpenAIClient.js): add support for OpenRouter API

* chore: comment out token debugging

* chore: add back streamResult assignment

* chore: remove double condition/assignment from merging

* refactor(routes/endpoints): -> controller/services logic

* feat: add openrouter model fetching

* chore: remove unused endpointsConfig in cleanupPreset function

* refactor: separate models concern from endpointsConfig

* refactor(data-provider): add TModels type and make TEndpointsConfig adaptible to new endpoint keys

* refactor: complete models endpoint service in data-provider

* refactor: onMutate for refreshToken and login, invalidate models query

* feat: complete models endpoint logic for frontend

* chore: remove requireJwtAuth from /api/endpoints and /api/models as not implemented yet

* fix: endpoint will not be overwritten and instead use active value

* feat: openrouter support for plugins

* chore(EndpointOptionsDialog): remove unused recoil value

* refactor(schemas/parseConvo): add handling of secondaryModels to use first of defined secondary models, which includes last selected one as first, or default to the convo's secondary model value

* refactor: remove hooks from store and move to hooks
refactor(switchToConversation): make switchToConversation use latest recoil state, which is necessary to get the most up-to-date models list, replace wrapper function
refactor(getDefaultConversation): factor out logic into 3 pieces to reduce complexity.

* fix: backend tests

* feat: optimistic update by calling newConvo when models are fetched

* feat: openrouter support for titling convos

* feat: cache models fetch

* chore: add missing dep to AuthContext useEffect

* chore: fix useTimeout types

* chore: delete old getDefaultConvo file

* chore: remove newConvo logic from Root, remove console log from api models caching

* chore: ensure bun is used for building in b:client script

* fix: default endpoint will not default to null on a completely fresh login (no localStorage/cookies)

* chore: add openrouter docs to free_ai_apis.md and .env.example

* chore: remove openrouter console logs

* feat: add debugging env variable for Plugins

api/app/clients/ChatGPTClient.js

@@ -179,6 +179,11 @@ class ChatGPTClient extends BaseClient {
       opts.headers.Authorization = `Bearer ${this.apiKey}`;
     }
 
+    if (this.useOpenRouter) {
+      opts.headers['HTTP-Referer'] = 'https://librechat.ai';
+      opts.headers['X-Title'] = 'LibreChat';
+    }
+
     if (this.options.headers) {
       opts.headers = { ...opts.headers, ...this.options.headers };
     }