AI short: separate timed summary scenes, remove subtitles

Restore Space to revision 33c3dda

AI short scenes per summary segment without subtitles

Restore Space to revision 33c3dda

Fix ai_patch syntax/self import and stabilize segmented shorts

Restore AI patch and replace subtitles with segmented shorts synced to voice

Topic creates per-article summaries, edge-tts voices, full-width text and burned subtitles

Fix topic data fallback, improve AI short progress UI, 1.2x voice and sentence pauses

Improve topic rewrite context, add voice/emotion short options and AI shorts slide

Fix Qwen readiness: add HTTP router fallback and extractive fallback

Fix AI summaries dedupe and clarify shorts creation flow

Patch AI wall compatibility endpoints and frontend overrides