canglan 4c221ad6f1 docs: full API documentation + data compat guard ...

- docs/API.md: complete API reference (auth/identities/tickets/bans/users/
  settings/notifications/polls/features/export/captcha/uploads/external/
  install/health) with auth, rate limits, roles, data migration notes
- auth.js register: also check user_identities for duplicate game_name
  (multi-identity compat for old data backfilled into new table)
- README: link API docs, multi-identity section

2026-08-17 01:20:39 +08:00

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