AuralArchive - v0.1.3-alpha

v0.1.3: Added NZB support, Prowlarr indexer, Docker PUID/PGID fixes

• Added SABnzbd and NZBGet download clients (experimental) — closes #8
• Added Prowlarr, NZBHydra2, and Newznab/Torznab indexer support — closes #6
• Added real search probe to indexer test_connection() with capabilities cache
• Added 7-day disk cache for indexer capability detection
• Fixed entrypoint.sh to handle pre-existing GID/UID gracefully — closes #5
• Fixed password length validation to return explicit "too long" error — closes #7
• Fixed ABS sync pagination and JSON serialization errors — closes #4
• Fixed Werkzeug RuntimeError allow_unsafe_werkzeug on startup — closes #1
• Fixed Docker volume path documentation (/import not /imports) — closes #2