- Add capsule_reports table and admin UI: new /capsule-reports page with list/update handlers
- POST /capsules/:id/entries/:entryId/report: members can report encrypted entries with voluntary decrypted sample
- GET /image-proxy: stream external images (Reddit, GifCities) through server to hide client IPs
- group_chat_tab: add GIF picker, report button, proxy external GIF URLs through ApiConfig.proxyImageUrl()
- api.ts: add list
