feat: add Apple Liquid Glass templates, image security settings, and automated releases
## New Features
- Apple Liquid Glass CSS template with iOS 26-inspired design
- Liquid Glass Dark theme with neon accents
- Image Security settings tab with per-event protection levels
- Release Please automation for versioning and changelog
## Improvements
- Update CSS template migration with final working templates
- Add search placeholder visibility fix for glass themes
- Update README roadmap (Download Protection, Gallery Templates, Filtering & Export now implemented)
## Infrastructure
- Add release-please.yml workflow for automated releases
- Add release-please-config.json and manifest
- Update docker-build.yml with Release Please integration comments
- Add comprehensive CHANGELOG.md
## Cleanup
- Add working/planning docs to .gitignore (CLAUDE.md, test-*.md, feature-*.md, etc.)
- Remove internal planning documents from git tracking (kept locally)
## Files Added
- .github/workflows/release-please.yml
- .release-please-manifest.json
- release-please-config.json
- CHANGELOG.md
- frontend/src/features/settings/tabs/ImageSecurityTab.tsx
Paul Nothaft
6033461be1