feat: 31 languages + disk safety panel + electron auto-updater + VM uninstall

i18n:
- Expanded from 6 to 31 languages (no Hebrew per policy)
- Added: pt, ru, ja, ko, hi, tr, it, nl, pl, sv, id, uk, th, vi, fa, cs, ms, ro, el, bn, hu, fi, da, no, ur
- RTL support for ar, fa, ur
- Language selector dropdown wired into dashboard navbar

Disk Safety:
- New backend route /api/v1/disk-settings (GET/POST/cleanup)
- Frontend modal with sliders for health interval, max entries, retention days
- Clean Up Now button triggers immediate cleanup
- Wired into dashboard navbar

Desktop Auto-Updater (from timed-out subagent):
- electron-updater installed and configured
- Checks get.dashcaddy.net/release/ for updates
- Publish config added to package.json

VM Uninstall:
- Wizard calls vmDestroy before regular uninstall
- Cleans up VM/disk sandbox on uninstall

Cleanup:
- Recursive data nesting guard (nesting-guard.js)
- Removed 242MB of data/data/data/ duplicates

status/index.html

@@ -207,6 +207,7 @@
             <button id="audit-log-btn" aria-label="Audit log">📜 Audit</button>
             <button id="security-center-btn" aria-label="Security Center">🛡️ Security</button>
             <button id="log-insights-btn" aria-label="Log Insights">🔍 Insights</button>
+            <button onclick="openDiskSettings()" aria-label="Disk Safety">💾 Disk</button>
             <button id="docker-resources-btn" aria-label="Docker resources">🐳 Docker</button>
           </div>
         </div>
@@ -952,7 +953,9 @@
 
   <!-- Tailscale device list panel (self-contained, polls /api/v1/tailscale/devices) -->
   <script src="/js/log-insights.js" defer></script>
+  <script src="/js/disk-settings.js" defer></script>
   <script src="/js/tailscale-devices.js" defer></script>
+  <script src="/js/language-selector.js" defer></script>
 
   <!-- Bundled JS (built with: npm run build) -->
   <script src="/dist/core.js" defer></script>