Moved various helper, event, and utility files from napcat-common to napcat-core/helper for better modularity and separation of concerns. Updated imports across packages to reflect new file locations. Removed unused dependencies from napcat-common and added them to napcat-core where needed. Also consolidated type definitions and cleaned up tsconfig settings for improved compatibility.
Moved file element creation methods (for file, picture, video, and ptt) from napcat-core/apis/file.ts to a new OneBotFileApi class in napcat-onebot/api/file.ts. Updated package.json dependencies to remove unused packages and fix workspace references. This improves separation of concerns and modularity between core and onebot-specific logic.
