* Migrate S3 storage module with unit and integration tests
- Migrate S3 CRUD and image operations to packages/api/src/storage/s3/
- Add S3ImageService class with dependency injection
- Add unit tests using aws-sdk-client-mock
- Add integration tests with real s3 bucket (condition presence of AWS_TEST_BUCKET_NAME)
* AI Review Findings Fixes
* chore: tests and refactor S3 storage types
- Added mock implementations for the 'sharp' library in various test files to improve image processing testing.
- Updated type references in S3 storage files from MongoFile to TFile for consistency and type safety.
- Refactored S3 CRUD operations to ensure proper handling of file types and improve code clarity.
- Enhanced integration tests to validate S3 file operations and error handling more effectively.
* chore: rename test file
* Remove duplicate import of refreshS3Url
* chore: imports order
* fix: remove duplicate imports for S3 URL handling in UserController
* fix: remove duplicate import of refreshS3FileUrls in files.js
* test: Add mock implementations for 'sharp' and '@librechat/api' in UserController tests
- Introduced mock functions for the 'sharp' library to facilitate image processing tests, including metadata retrieval and buffer conversion.
- Enhanced mocking for '@librechat/api' to ensure consistent behavior in tests, particularly for the needsRefresh and getNewS3URL functions.
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Co-authored-by: Danny Avila <danny@librechat.ai>