feat(extras): add sync-cc service — Whisper/ffsubsync subtitle tool

Adds sync_cc as an extras service module:
- extras/sync_cc.py: the Python tool (3196 lines) — 8 modes: SYNC,
  GENERATE, BATCH, RENAME (TMDB), EXTRACT, REMUX, EMBED, BURNSUBS
- services/sync-cc.sh: installs system deps (python3, ffmpeg, mkvtoolnix,
  ccextractor), pip installs openai-whisper + ffsubsync, copies the script
  to ~/sync-cc/, prompts for TMDB API key → .env, creates /usr/local/bin/sync-cc
  wrapper so users run it from any directory containing video/SRT files

Heavy optional deps (easyocr, pgsreader) are installed on first use by the
script itself. GPU (CUDA/MPS) is used automatically if detected.

https://claude.ai/code/session_01Y4dMKtkqkpvmgDKoRdzhTG

MODULAR.md

@@ -97,5 +97,5 @@ is retained as a frozen evolution record.
 | `media` | `arm`, `audiobookshelf`, `emby`, `immich`, `jellyfin`, `lyrion` |
 | `cameras` | `frigate`, `frigate-notify` |
 | `gaming` | `js99er`, `minecraft`, `wolf`, `wolf-pair` |
-| `extras` | `linux-to-sync`, `silent-send` |
+| `extras` | `linux-to-sync`, `silent-send`, `sync-cc` |
 | `backup` | `backup` |