v1.0.9-beta.043 - perf(cache): add issue details caching and cleanup notifications
- Implements a global Axios keep-alive agent (apiClient) to eliminate TLS handshake overhead on external API requests.
- Adds a 24-hour database cache to the /api/issue-details route, dramatically speeding up the one-click request modal on the Discover page.
- Creates a new dedicated CACHE_CLEANUP background job in src/lib/queue.ts to automatically sweep and delete expired cache entries.
- Updates the Admin Scheduled Jobs UI to allow scheduling and manual triggering of the new Cache Cleanup job.
- Adds Cache Cleanup Complete as a configurable Discord webhook event in the Admin Settings and Initial Setup UI.
- Updates the Discord notifier to format and dispatch alerts when the cache cleanup job finishes.
Resolves #109