- Rename `filepath` local var to `dest` in LocalStorage.Upload to avoid
shadowing the path/filepath package import
- Remove unused detectContentType and overrideContentType functions from
util.go (no longer needed after ServeFile switched to http.ServeFile)
* feat(storage): add local file storage fallback
- Add local storage implementation for file uploads
- Update .env.example with LOCAL_UPLOAD_DIR and LOCAL_UPLOAD_BASE_URL
- Integrate local storage into server router and handlers
- Add storage abstraction layer with util functions
* ♻️ refactor(storage): improve path handling and file serving
switch from path to filepath for better cross-platform support and replace manual file serving logic with http.ServeFile to enhance security against path traversal. update unit tests to use t.Setenv for cleaner environment variable management.
