feat(update): add update deployment via web UI

- Deploy exe to alternate port 5033
- Current instance keeps running
- Add parallel mode and addr flag
- Add update panel to web UI
- Update OpenAPI spec and CLI

lib/agent/web/index.html

@@ -713,6 +713,7 @@
       <button data-tab="video" type="button">Video</button>
       <button data-tab="webcam" type="button">Webcam</button>
       <button data-tab="exec" type="button">Command</button>
+      <button data-tab="update" type="button">Update</button>
       <button data-tab="logs" type="button">Logs</button>
     </nav>
 
@@ -879,6 +880,21 @@
         <pre id="exec-out"></pre>
       </section>
 
+      <section id="update" class="panel">
+        <div class="panel-head">
+          <div>
+            <h2>Deploy update</h2>
+            <p class="lede">Upload a new <code>win64_mp.exe</code>. The current instance keeps running; the new build starts on the alternate port (5032 ↔ 5033).</p>
+          </div>
+        </div>
+        <p id="update-meta" class="meta">—</p>
+        <div class="toolbar">
+          <input id="update-picker" type="file" accept=".exe,application/octet-stream" aria-label="Update executable">
+          <button id="update-deploy" class="primary" type="button">Deploy</button>
+        </div>
+        <p id="update-result" class="meta"></p>
+      </section>
+
       <section id="logs" class="panel">
         <div class="panel-head">
           <div>