docs(site): add remote-access (Tailscale/Cloudflare/ngrok) and honest iOS pages

New high-intent SEO pages:
- /remote-access/ — step-by-step Tailscale, Cloudflare Tunnel, ngrok setups
  for reaching a self-hosted opencode server from Android anywhere. HowTo +
  FAQ + BreadcrumbList structured data.
- /ios/ — honest 'no iOS app yet' page: current Android app, why, options,
  roadmap, how to follow. FAQ + BreadcrumbList structured data.

Added to sitemap.xml; internal links from index, guide, opencode-on-phone,
and troubleshooting.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

docs-site/index.html

@@ -364,7 +364,7 @@ OPENCODE_SERVER_PASSWORD=yourpassword opencode serve --hostname 0.0.0.0 --port 4
       </details>
       <details>
         <summary>Is there an iOS app?</summary>
-        <p>No. OpenCode Mobile is Android only. There is no iOS or iPadOS build.</p>
+        <p>No. OpenCode Mobile is Android only. There is no iOS or iPadOS build. More on the <a href="ios/">iOS / iPhone page</a>.</p>
       </details>
       <details>
         <summary>Where do my API keys live?</summary>
@@ -385,6 +385,8 @@ OPENCODE_SERVER_PASSWORD=yourpassword opencode serve --hostname 0.0.0.0 --port 4
       <a href="download/">Download</a>
       <a href="guide/">Setup guide</a>
       <a href="opencode-on-phone/">OpenCode on your phone</a>
+      <a href="remote-access/">Remote access</a>
+      <a href="ios/">iOS / iPhone</a>
       <a href="features/">Features</a>
       <a href="comparison/">Comparison</a>
       <a href="vs-termux/">vs Termux</a>