scalability: create users API service
- Created apps/web/src/services/api/users.ts
- Wraps profile functions: getProfile, getProfileByUsername, updateProfile, calculateProfileCompletion
- Wraps social functions: follow, unfollow, getFollowers, getFollowing
- Wraps settings functions: getSettings, updateSettings
- Wraps avatar functions: uploadAvatar, deleteAvatar
- Re-exports all related types for convenience
- Added to services/api/index.ts for barrel export
- No TypeScript errors
- Follows existing service layer pattern (similar to tracks.ts)
- Action 6.1.1.3 complete