feat: native Prowlarr indexer sync (add Prowlarr once, sync all indexers)

[vavallee]

Summary

Currently, adding Prowlarr-managed indexers to Bindery requires adding each indexer individually as a Torznab feed URL (e.g. http://prowlarr:9696/1/api?apikey=...). Radarr and Sonarr support a proper Prowlarr app-integration where you add Prowlarr once and it automatically syncs all configured indexers.

Requested behaviour

Add Prowlarr as an "indexer source" in Settings. Bindery queries the Prowlarr API (/api/v1/indexer) to fetch all configured indexers and their Torznab feed URLs, then creates/updates/removes the corresponding Bindery indexer entries automatically.

This matches how Radarr/Sonarr handle Prowlarr: one entry, synced automatically, no per-indexer manual setup.

Current workaround

Add each Prowlarr-managed indexer individually:

1. In Prowlarr, click the RSS/Torznab icon next to each indexer
2. Copy the per-indexer URL (http://prowlarr:9696/{n}/api?apikey=KEY)
3. Add it to Bindery as a separate indexer entry

Implementation notes

• Prowlarr exposes indexers at GET /api/v1/indexer (requires X-Api-Key header)
• Each entry has a fields array containing the Torznab url and apiKey
• A sync could run on startup and on a configurable interval, or be triggered manually from Settings
• The Bindery indexer type field would need a new value (e.g. prowlarr) to distinguish synced entries from manually-added ones, so they can be updated/removed without user intervention

[dginther]

Funny enough I almost added this when i was making the Transmission client addition.

[Fonzi03]

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