recipe-maintainer: public snapshot (secrets + deployment plans removed, single commit)

Sanitized single-commit public mirror of recipe-maintainer.
- Removed test-ssh/.testenv (live creds); added test-ssh/.testenv.example placeholders.
- Removed plans/ and planned-updates/ (deployment-planning docs) so no client/
  deployment domains appear in the public repo.
- All other secret stores were already gitignored.
- docs.coopcloud.tech retained as a submodule (public upstream).

recipe-info/custom-html/tests/health_check.py

@@ -0,0 +1,28 @@
+#!/usr/bin/env python3
+"""Health check for custom-html."""
+import argparse
+import os
+import sys
+
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..', '..', '..'))
+from utils.tests.helpers import http_get, resolve_domain
+
+
+def main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument('--domain', default=os.environ.get('TEST_DOMAIN'))
+    args = parser.parse_args()
+    domain = args.domain or resolve_domain('custom-html')
+    url = f"https://{domain}"
+
+    print(f"Checking custom-html at {url} ...")
+    status, _ = http_get(url)
+    if status == 200:
+        print(f"PASS: custom-html returned HTTP {status}")
+    else:
+        print(f"FAIL: custom-html returned HTTP {status} (expected 200)")
+        sys.exit(1)
+
+
+if __name__ == '__main__':
+    main()