feat(arrs): support retroactive stats updates and dynamic indexer health classification

[drondeseries]

Description

Consolidates real-time indexer statistics mapping, implements a native starr API background recovery worker to heal missed webhooks, and refines the Indexer Health dashboard.

Core Changes:

1. Real-time Webhook Linkage: Captures the ARR download_id during grabs and imports, retroactively updating indexer_import_stats to correct any out-of-order webhook delivery.
2. Background Recovery Sync: Implements a native, rate-limited background worker that runs every 15 minutes. It queries the local database for Unknown indexers with a download_id, queries the starr history APIs to resolve their actual indexers, and retroactively updates the DB. It operates with zero-overhead (making zero network requests when no gaps are present).
3. Indexer Health Classifications: Updates the indexer health status scales to:
   • Excellent (>= 85.0%) ➡️ EXCELLENT (Teal)
   • Moderate (50.0% to 84.9%) ➡️ MODERATE (Amber/Yellow)
   • Poor (< 50.0%) ➡️ POOR (Rose/Red)
4. UX Design Polishes:
   • Renders the telemetry status warning as Review failure logs when underperforming.
   • Automatically displays a positive green card (All indexers performing well) when all indexers are at or above 75% success.
   • Hides the indexer names from the success bar chart's X-axis (tick={false}) to prevent text overlapping and crowdiness while keeping interactive tooltips fully operational.

[javi11]

Why you are doing this?

[drondeseries]

This was temporarily added to test our local changes/fixes for nntppool during development. Since the testing is complete and the replace directive is no longer in go.mod, I've removed this from the Dockerfile in the latest commit.