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/manifest/i18n.ts

@@ -10,12 +10,13 @@ export const long = {
     'summaries with timestamps. Features include channel and podcast subscriptions ' +
     'with automatic new episode detection, a background processing queue with ' +
     'configurable delays, auto-download per subscription, organized history with ' +
-    'folders, multiple AI model support, and a responsive web interface. ' +
+    'folders, and a responsive web interface. ' +
     'Requires a Google Gemini API key (free tier available at aistudio.google.com/apikey).',
 }
 
 export const alertInstall = {
   en_US:
-    'After installing, open the web UI and enter your Google Gemini API key in Settings. ' +
-    'For reliable YouTube downloads, set up OAuth2 authentication in Settings > YouTube Authentication.',
+    'After installing, configure your Google Gemini API key using the "Set Gemini API Key" ' +
+    'action in the service menu. A free API key is available at aistudio.google.com/apikey. ' +
+    'Note: The embedded YouTube player will not work if you are connected to a VPN.',
 }