- Tag and ChannelTag models + migration 0003 (partial unique indexes split
system vs per-user tag names)
- Offline language detection (py3langid) constrained to a curated language set,
with the channel's declared default language as a strong prior
- Topic tags mapped from YouTube topicDetails + dominant video category; the
generic "Lifestyle" catch-all is intentionally dropped
- System (auto) tags are regenerated idempotently and never touch user tags;
orphaned system tags are cleaned up
- GET /api/tags and admin POST /api/tags/recompute; scheduled autotag job
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