* 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