feat(ui,server): surface active instance service URLs in About settings (#2669)

Show the running instance's local server URL and tunnel URL (when a
tunnel is active) as labeled, click-to-open buttons on the About page.
/api/system/info now reports the instance port and tunnel URL, resolved
lazily from the tunnel runtime so each Git-worktree instance identifies
itself in the UI without parsing terminal output.

Refs OPE-194

packages/ui/src/lib/i18n/messages/uk.settings.ts

@@ -431,6 +431,9 @@ export const settingsDict = {
   "settings.openchamber.about.title": "Про OpenChamber",
   "settings.openchamber.about.field.version": "Версія",
   "settings.openchamber.about.field.openCodeVersion": "Версія OpenCode",
+  "settings.openchamber.about.field.instanceUrls": "URL-адреси екземпляра",
+  "settings.openchamber.about.field.applicationUrl": "Застосунок",
+  "settings.openchamber.about.field.tunnelUrl": "Тунель",
   "settings.openchamber.about.state.checking": "Перевірка...",
   "settings.openchamber.about.state.upToDate": "В актуальному стані",
   "settings.openchamber.about.state.unknown": "невідомо",