Save in-progress keysat integration and StartOS 0.4 work

Snapshot of the working tree before cleanup. Captures:
- Keysat licensing: server/license.js, /api/license/* endpoints in
  server/index.js, activation modal in public/index.html, embedded
  Ed25519 issuer key (assets/issuer.pub).
- StartOS 0.4 expansion: setApiKey action, version files v0.1.1
  through v0.1.15, file-models/config.json.ts, manifest updates.
- Self-hosted registry server (startos-registry/).
- Build/deploy scripts (bin/bump-version.sh, bin/deploy.sh, vendored
  yt-dlp binary), .gitignore, .deploy.env.example.
- Recent design docs (KEYSAT_INTEGRATION.md, UPGRADE-DESIGN.md) —
  retained here so they remain recoverable when removed in the
  follow-up cleanup commit.

startos-registry/node_modules/escape-html/index.js

@@ -0,0 +1,78 @@
+/*!
+ * escape-html
+ * Copyright(c) 2012-2013 TJ Holowaychuk
+ * Copyright(c) 2015 Andreas Lubbe
+ * Copyright(c) 2015 Tiancheng "Timothy" Gu
+ * MIT Licensed
+ */
+
+'use strict';
+
+/**
+ * Module variables.
+ * @private
+ */
+
+var matchHtmlRegExp = /["'&<>]/;
+
+/**
+ * Module exports.
+ * @public
+ */
+
+module.exports = escapeHtml;
+
+/**
+ * Escape special characters in the given string of html.
+ *
+ * @param  {string} string The string to escape for inserting into HTML
+ * @return {string}
+ * @public
+ */
+
+function escapeHtml(string) {
+  var str = '' + string;
+  var match = matchHtmlRegExp.exec(str);
+
+  if (!match) {
+    return str;
+  }
+
+  var escape;
+  var html = '';
+  var index = 0;
+  var lastIndex = 0;
+
+  for (index = match.index; index < str.length; index++) {
+    switch (str.charCodeAt(index)) {
+      case 34: // "
+        escape = '&quot;';
+        break;
+      case 38: // &
+        escape = '&amp;';
+        break;
+      case 39: // '
+        escape = '&#39;';
+        break;
+      case 60: // <
+        escape = '&lt;';
+        break;
+      case 62: // >
+        escape = '&gt;';
+        break;
+      default:
+        continue;
+    }
+
+    if (lastIndex !== index) {
+      html += str.substring(lastIndex, index);
+    }
+
+    lastIndex = index + 1;
+    html += escape;
+  }
+
+  return lastIndex !== index
+    ? html + str.substring(lastIndex, index)
+    : html;
+}