* test: reproduce issue #786
* fix: load extra headers from settings (closes#786)
* test: cover extra header precedence and redaction
* fix: redact persisted extra headers in diagnostics
* test: cover runner extra header identity
* fix: restart runner when extra headers change
- Add settings.json column to environment variables table with key name mappings
- Document missing ENV variables: TELEGRAM_BOT_TOKEN, TELEGRAM_NOTIFICATION,
HAPI_RELAY_FORCE_TCP, VAPID_SUBJECT
- Add settings.json example with configuration priority explanation
- Create JSON Schema file for settings.json validation and editor autocompletion
with all fields, descriptions, and ENV variable references
clsoe #113
- Initialize VitePress documentation site with config, index, and guides
- Add guides for quick-start, installation, PWA, how-it-works, FAQ, and why HAPI
- Update .gitignore to exclude VitePress cache directory
- Update logo.svg with actual icon from web/public/icon.svg
- Simplify README.md with link to full installation guide
- Remove redundant WHY_NOT_HAPPY.md (content migrated to why-hapi guide)
