Fix kitchen monitor autosave and CSP theme script

[osswald]

Summary

• Include kitchenMonitors in the event configuration autosave watch source so adding or editing kitchen monitors triggers a save (fixes production issue where kitchen monitor changes were never persisted).
• Add a regression test documenting that unwatched snapshot fields do not trigger autosave.
• Move the theme bootstrap script from inline index.html to public/theme-init.js so it complies with production CSP (script-src 'self').

Test plan

• cd cloud/frontend && npm test (153 tests pass)
• On admin.vendiqo.ch, open an event with kitchen monitors enabled, add a kitchen monitor printer, confirm autosave completes (~800ms) and persists after reload
• Confirm browser console no longer shows CSP violation for inline script on page load

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