fix(site): use support@agentlabs.cc for opencode-mobile support contact (#84)

The website's Support, Privacy, and Terms pages still showed
support@vibebrowser.app — leftover boilerplate from the parent
VibeBrowser product. App store listings, the privacy policy source
(distribution/privacy-policy.html), F-Droid metadata, and the in-app
mailto already use support@agentlabs.cc, so this brings the website
in line with the canonical support address.

Changed:
- website/app/support/page.tsx: mailto link + two visible address strings
- website/app/privacy/page.tsx: fallback contact string shown only if
  distribution/privacy-policy.html fails to load
- website/app/terms/page.tsx: Section 7 (No Support Obligation) and
  Section 14 (Contact) mailto links

Left untouched: AGENTS.md's VIBEBROWSER_REMOTE_URL example (a real
VibeBrowser relay URL, unrelated product) and historical planning notes
(context.md, HANDOFF.md, .autopilot/state.md) documenting the prior
opencode.vibebrowser.app/privacy hosting decision — those are logs of
past decisions, not live support/contact surfaces.

Co-authored-by: engineer <engineer@gray-knight-m1.local>

website/app/terms/page.tsx

@@ -128,7 +128,7 @@ export default function TermsPage() {
             GitHub Issues
           </a>{' '}
           and via{' '}
-          <a href="mailto:support@vibebrowser.app">support@vibebrowser.app</a>, but we make no
+          <a href="mailto:support@agentlabs.cc">support@agentlabs.cc</a>, but we make no
           guarantees about response times or resolution.
         </p>
         <p>
@@ -191,7 +191,7 @@ export default function TermsPage() {
           Seattle, WA 98108-4522<br />
           USA<br />
           Email:{' '}
-          <a href="mailto:support@vibebrowser.app">support@vibebrowser.app</a>
+          <a href="mailto:support@agentlabs.cc">support@agentlabs.cc</a>
         </p>
       </div>
     </div>