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chore(kudos): retire unused kudos scoring system (#802)

Kudos scores were recalculated daily by `users:update-kudos` (and the
legacy V1 cron/users_kudos.php before it) and written to the users_kudos
table, but the stored values were never read by any live API, front-end,
or automated code path. The only readers were three legacy V1 PHP helpers
— getKudos (internal), topKudos (tests only) and possibleMods (a manual
mod-finder CLI that recomputes kudos itself) — none exposed via any API
or UI. The feature is dead, so retire it.

Removed:
- Laravel: UpdateKudosCommand + its daily schedule entry, and the
  UserManagementService updateKudos/updateKudosForUser/calculateKudos
  methods, plus their tests.
- Go: the users:update-kudos housekeeper registry entry and users_kudos
  from the per-user support-dump collector (collect_db.go).
- V1 PHP: User::getKudos/updateKudos/topKudos/possibleMods, the unused
  KUDOS_* level constants, cron/users_kudos.php, cli/users_kudos_group.php,
  and the testKudos unit test.

Drops the users_kudos table via a Laravel migration, with an idempotent
companion .sql for manual application on production (see PR body).

Tests: Laravel 39/0, Go 3187/0, V1 UserTest 91/0 — all green locally.

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

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