feat: Admin panel completions — audit log, waitlist, feed reset, profile edit for all users
- Remove is_official gate: profile editor and follow manager now shown for all users
- Add /audit-log page: paginated view of all admin actions
- Add /waitlist page: approve/reject/delete waitlist entries with notes
- Add Feed Impression Reset button on user detail (clears user's seen-posts history)
- Add feed cooling/diversity thresholds to algorithm_config defaults (configurable via /algorithm)
- Go: AdminListWaitlist, AdminUpdateWaitlist, AdminDeleteWaitlist handlers
- Go: AdminResetFeedImpressions handler (DELETE /admin/users/:id/feed-impressions)
- Go: Register all new routes in main.go
- Sidebar: add Waitlist (Users & Content) and Audit Log (Platform) links
- DB: add 20260218_waitlist.sql migration
- api.ts: listWaitlist, updateWaitlist, deleteWaitlist, resetFeedImpressions methods
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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