- Added FollowUser and UnfollowUser handlers in ProfileHandler
- Added socialService field and SetSocialService method
- Initialized SocialService in setupUserRoutes
- Added routes: POST /users/:id/follow and DELETE /users/:id/follow
- Handlers use existing SocialService methods
- Includes validation to prevent users from following themselves
- Handlers use standard API response format
Phase: PHASE-2
Priority: P2
Progress: 26/267 (9.7%)
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