Backend Infrastructure:
- Add circle_members table and is_in_circle() SQL function
- Implement GetFollowers/GetFollowing with pagination and trust scores
- Add complete circle management (add/remove/list members)
- Create comprehensive data export for GDPR compliance
API Endpoints:
- GET /users/:id/followers - List user's followers
- GET /users/:id/following - List users they follow
- POST /users/circle/:id - Add to close friends circle
- DELETE /users/circle/:id - Remove from circle
- GET /users/circle/members - List circle members
- GET /users/me/export - Export all user data as JSON
Note: Circle visibility enforcement in feed queries needs manual completion in post_repository.go GetFeed(), GetPostsByAuthor(), and GetPostByID() methods.
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