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Final step of the native Patreon ingester: a first-class Recovery action, and removal of the now-dead gallery-dl Patreon path. Recovery (rules #23/#24/#27 — full product, with UI): - source_service.start_recovery arms the #693 backfill state machine PLUS `_backfill_bypass_seen`, flipping download mode to recovery (bypass the seen-ledger to re-fetch dropped-and-deleted near-dups and re-evaluate under the current pHash threshold). Stop via the shared stop_backfill. - SourceRecord exposes backfill_bypass_seen; POST /sources/{id}/backfill gains action="recover". - Frontend: Recovery button (Patreon-only, mdi-backup-restore) on SourceRow + SourceCard; the running badge labels "Recovering (N)" vs "Backfilling (N)"; the Stop tooltip says "Stop recovery". sources.js recoverSource + SubscriptionsTab onRecover. Cutover (rule #22 — no legacy): - gallery_dl: removed PLATFORM_DEFAULTS["patreon"], the patreon files/cursor branch in _build_config_for_source, and the patreon/Mux yt-dlp Referer/Origin block (was patreon-specific and wrongly tagged the other platforms' yt-dlp fetches; native ingester owns it now). - download_service: removed the dead campaign-id-retry helpers (_looks_like_campaign_id_failure / _CAMPAIGN_ID_FAILURE_PATTERN) and _effective_url. Vanity→campaign resolution + resume_cursor + the cursor/PARTIAL lifecycle stay — they serve the native ingester. Tests: removed the two obsolete patreon-gallery-dl config tests (yt-dlp Referer, resume-cursor); repointed the generic skip-value config tests to subscribestar; added start_recovery + recover-endpoint coverage (backfill_bypass_seen). gallery-dl stays for the other 5 platforms. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>