Website with a feedback form that opens GitHub issues, and pi's contributor gate

- site/: landing page, /feedback/ and /privacy/ on Cloudflare Pages
  (frame-control.pages.dev). POST /api/feedback validates the form and opens
  a labelled issue with a fine-grained token; honeypot, minimum fill time and
  KV rate limits keep spam out. Ko-fi donate buttons appear once the page
  name is set in site/public/js/site.js.
- .github: the issue and PR gate from badlogic/pi-mono. New contributors'
  issues and PRs are auto-closed; a maintainer replying lgtmi/lgtm approves
  them via APPROVED_CONTRIBUTORS. Issue templates and CONTRIBUTING.md.
- CI runs the website tests; README points feedback at the form.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

.github/APPROVED_CONTRIBUTORS

@@ -0,0 +1,9 @@
+# GitHub handles approved to bypass contribution auto-close
+# Format: <username> <capability>
+# capability:
+#   issue  future issues stay open
+#   pr     future issues and PRs stay open
+# Maintainers add people by replying `lgtmi` or `lgtm` on an issue
+# (.github/workflows/approve-contributor.yml); editing this file by hand works too.
+
+fbl100 pr