Restore to commit 0280ca577f097d7e64a3c6679c5f592feb6ba938

Restore to commit b915c23c (force reset main branch)

Upload ai_runtime_final6.py

Apply shorts feature from commit 32da1baa - /api/shorts + /api/ai/short endpoints

Fix: use direct file read for index_v2.html

Fix incomplete FINAL6E_INJECT string - truncate and add minimal closing

Fix syntax error: truncate incomplete FINAL6E_INJECT string literal

Squash main