🔍 refactor: OCR Fully Optional with Defaults for "Upload as Text" (#9856)

* refactor: move `loadOCRConfig` from `packages/data-provider` to `packages/api` and return `undefined` if not explicitly configured

* fix: loadOCRConfig import from @librechat/api

* refactor: update defaultTextMimeTypes to support virtually all file types for text parsing

* fix: improve OCR capability check and error message for unsupported file types

* ci: remove unnecessary ocr expectation from AppService test

api/server/services/AppService.js

@@ -1,16 +1,12 @@
+const { FileSources, EModelEndpoint, getConfigDefaults } = require('librechat-data-provider');
 const {
   isEnabled,
+  loadOCRConfig,
   loadMemoryConfig,
   agentsConfigSetup,
   loadWebSearchConfig,
   loadDefaultInterface,
 } = require('@librechat/api');
-const {
-  FileSources,
-  loadOCRConfig,
-  EModelEndpoint,
-  getConfigDefaults,
-} = require('librechat-data-provider');
 const {
   checkWebSearchConfig,
   checkVariables,