* feat: implement basic newsletter functionality with socket integration and event handling
* feat: enhance media handling for newsletters with raw media upload support
* feat: working updatePicture, removePicure, adminCount, mute, Unmute
* fix: fetchMessages
* chore: cleanup
* fix: update newsletter metadata path and query ID for consistency. newsletterMetadata works now
* chore: enhance newsletter metadata parsing and error handling
* fix: correct DELETE QueryId value in Newsletter.ts
* chore: split mex stuffs to own file
* chore: remove as any
