- New cmd/anvilwebgw: standalone HTTP gateway daemon with start/stop/fgstart/status
subcommands, exposing all 9P-connected API endpoints on :8081
- cmd/anvilweb simplified to a plain static file server that reverse-proxies
/api/* to anvilwebgw; removes all 9P connectivity
- Frontend error handling overhauled: replace alert() with styled dismissible
error banner and inline container errors showing actual server response detail
- Fix CSS specificity bug that kept error banner always visible
- Fix nil slice JSON encoding (null vs []) for empty inbox/archive responses
- mkfile: add anvilwebgw build and clean targets
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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