Release v1.3.0: Multi-source downloads, audio analyzer resilience, mobile improvements

Major Features:
- Multi-source download system (Soulseek/Lidarr with fallback)
- Configurable enrichment speed control (1-5x)
- Mobile touch drag support for seek sliders
- iOS PWA media controls (Control Center, Lock Screen)
- Artist name alias resolution via Last.fm
- Circuit breaker pattern for audio analysis

Critical Fixes:
- Audio analyzer stability (non-ASCII, BrokenProcessPool, OOM)
- Discovery system race conditions and import failures
- Radio decade categorization using originalYear
- LastFM API response normalization
- Mood bucket infinite loop prevention

Security:
- Bull Board admin authentication
- Lidarr webhook signature verification
- JWT token expiration and refresh
- Encryption key validation on startup

Closes #2, #6, #9, #13, #21, #26, #31, #34, #35, #37, #40, #43

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,37 @@
+## Description
+
+<!-- Briefly describe what this PR does -->
+
+## Type of Change
+
+-   [ ] Bug fix (non-breaking change that fixes an issue)
+-   [ ] New feature (non-breaking change that adds functionality)
+-   [ ] Enhancement (improvement to existing functionality)
+-   [ ] Documentation update
+-   [ ] Code cleanup / refactoring
+-   [ ] Other (please describe):
+
+## Related Issues
+
+Fixes #
+
+## Changes Made
+
+-
+-
+-
+
+## Testing Done
+
+-   [ ] Tested locally with Docker
+-   [ ] Tested specific functionality:
+
+## Screenshots (if applicable)
+
+## Checklist
+
+-   [ ] My code follows the project's code style
+-   [ ] I have tested my changes locally
+-   [ ] I have updated documentation if needed
+-   [ ] My changes don't introduce new warnings
+-   [ ] This PR targets the `main` branch