feat(arrs): unified queue auto-cleanup with failure circuit breaker, Force Stop; dead-code sweep + health UI tidy

[yoshitaka420]

Summary

Two related bodies of work, build- and test-verified together (go build + full test suite, bun run check, vite production build):

1. Arrs queue auto-cleanup — automatic cleanup of stuck/failed imports across all six *arr types, with a per-target failure circuit breaker and an emergency Force Stop brake
2. Dead-code sweep + health UI tidy — removal of unreferenced code repo-wide and theme-consistent colors on the health pages

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1. Unified queue auto-cleanup (all six *arrs)

One cleanup pass per tick covers Radarr, Sonarr, Whisparr, Lidarr, Readarr and Sportarr (internal/arrs/worker/stuck_cleanup.go), replacing the per-type scaffold and the separate Import Failure Cleanup toggle:

• Ghost detection: queue items whose import already landed (confirmed via import history) or whose source path is gone are removed grace-free; a confirmed healthy import also resets the failure breaker for that target
• Message rules: configurable rule table (status-message substring → action) with actions remove / blocklist / blocklist_search, editable in the Arrs settings UI; rule actions are validated on config load and API save
• Grace period: items are only acted on after being continuously observed stuck past arrs.queue_cleanup_grace_period_minutes, so transient errors the *arr resolves on its own are left alone
• Safety: only queue items owned by AltMount's download client are ever touched (case-insensitive match, including renamed clients — fixes interop with other download clients' paths)

Per-target failure circuit breaker

arrs.queue_cleanup_max_failures (0 = off) counts AltMount-initiated actions per target (movie / episode / album / book) in a shared in-memory tracker (internal/arrs/failures) so a dead release cannot drive an endless grab → fail → re-grab loop. Three producers bump the same keys:

• queue cleanup actions
• health-repair re-searches (scanner) — at the threshold the target is unmonitored instead of re-searched
• import failures (importer postprocessor → worker.HandleImportFailure) — catches the fast-fail loop where the *arr blocklists one GUID and instantly re-grabs the same release from another indexer; at the threshold the target is unmonitored first, then the queue record is removed with blocklist + skipRedownload

Counters reset when the target later imports healthy. In-memory only; clears on restart.

Force Stop brake

Emergency pause (API: GET/POST/DELETE /api/arrs/pause; UI control in the Queue page cleanup dropdown). While engaged, no *arr requests are issued: the cleanup tick, health-repair re-trigger, importer failure breaker and the indexer history sync all gate on it.

Related fixes

• health: never delete library files when ARR repair path-matching misses (fail-safe instead of fail-destructive)
• importer: post-import health checks are scheduled per written file — for multi-file imports (season packs) the old directory-path lookup failed silently and no checks were ever scheduled
• Sportarr: included in the config API response, its indexer is captured per download for indexer-health attribution, duplicate sample rule dropped
• docs + config.sample.yaml updated for the new options

2. Dead-code sweep + health UI tidy

Dead code removal (every removal verified by build + tests):

• Frontend: RCloneConfigSection, ManualScanSection, ActiveStreamsCard, RecentCompletions, HealthChart, QueueChart, KeyValueEditor, plus unused exports in ErrorAlert, LoadingSpinner, BytesDisplay, useConfig, webdavClient, api client/types
• Backend: internal/library (entire package), api/webdav auth_updaters, unused metadata/importer/utils/slogutil/encryption helpers, fuse server and rclonecli mount leftovers, unused API response helpers and routes
• internal/database/testing.go → testing_test.go (test-only helper no longer ships in the production build)

Health UI tidy — replace hardcoded tailwind palette colors (teal/emerald/amber/rose + rgba glows) with daisyUI theme tokens so the health pages follow the active theme:

• Indexer health: success/warning/error tokens for the three performance tiers, muted failure bar on excellent indexers, sort preference persisted in localStorage, best/worst chips and the comparison bar chart removed (low signal next to the per-indexer cards)
• Provider health: charts source palette + tooltip/cursor from theme vars (fixes stale daisyUI v4 hsl() tooltip), provider table badges and quota vials themed via base/success/warning/error tokens

Test plan

• go build ./... + full Go test suite green (new tests: failures tracker, worker breaker, import-failure flow with httptest fake Sonarr, registrar client matching, config validation)
• bun run check + vite production build green
• Cleanup + breaker verified end-to-end against a fake Sonarr (blocklist_search → escalate to blocklist+unmonitor at threshold; Force Stop halts polling)