fix(scheduler): never block API event loop — mutex + thread pool

feat: trend filter, engagement metrics, duplicate protection, watermark consistency

fix: Cloudinary async upload, calendar drag reschedule endpoint

feat: HF keep-alive, IG token reminder, auto hashtags, budget alerts, hashtag suggestions

fix: random music selection per post

feat: publish mode picker — normal post or reel

fix: carousel — fallback parser, count=1 bug, debug logging

feat: granular agent sub-steps, immediate WS push, all backend fixes

feat: surface agent auto-improve steps to progress bar

Initial deployment to HF Spaces