Update media-server: dynamic WebGL background with audio reactivity

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

CLAUDE.md

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+# Claude Assistant Guidelines
+
+This document contains guidelines for Claude when working on this project.
+
+## Git Workflow
+
+### Commits and Pushes
+
+**IMPORTANT: Never commit or push without explicit user approval.**
+
+When changes are ready to be committed:
+1. Make the code changes
+2. Show the user what will be committed (git status/diff)
+3. **Wait for explicit approval** from the user before running `git commit` and `git push`
+4. Only proceed with commits when the user says "commit and push" or similar
+
+### Commit Message Format
+
+Use the following format for commit messages:
+
+```
+<Short description of changes>
+
+<Optional longer description with bullet points>
+- Detail 1
+- Detail 2
+
+Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
+```
+
+## Project Structure
+
+This is a monorepo containing:
+- **haos-integration**: Home Assistant custom integration (submodule)
+- **media-server**: FastAPI media server (submodule)
+
+### Submodule Workflow
+
+When making changes:
+1. Commit changes in the submodule first
+2. Push the submodule
+3. Update the main repo to reference the new submodule commit
+4. Commit and push the main repo
+
+## Code Style
+
+- Follow existing code patterns
+- Add comprehensive documentation for new features
+- Update README files when adding new functionality
+- Include examples in documentation
+
+## Testing
+
+- Test changes locally before committing
+- Verify server restarts successfully after changes
+- Check integration compatibility with Home Assistant
+
+## Server Restart
+
+After making changes to the backend (Python files), restart the media server to apply them. Frontend-only changes (CSS, HTML, JS) are served as static files and only require a browser hard-refresh (Ctrl+Shift+R).