Improve portable launch, forge persistence, and operator auth UX.

Persist build extra_files for Build Manager history, print dashboard login on every start, add libp2p for Mesh P2P forge, defer WebSocket until login, and split devrun.bat from LAUNCH.bat with USB deck auto-detection.

server/web/src/pages/SettingsPage.tsx

@@ -1,6 +1,6 @@
 import { useState, useEffect, useRef } from 'react';
 import { api } from '../api/client';
-import { setStoredAuth, getStoredAuth, clearStoredAuth, authHeaders } from '../api/auth';
+import { setStoredAuth, getStoredAuth, clearStoredAuth } from '../api/auth';
 import type { ServerConfig } from '../types';
 import { HelpTip, FieldHint } from '../components/HelpTip';
 import NeonCard from '../components/NeonCard/NeonCard';
@@ -159,13 +159,7 @@ export default function SettingsPage() {
     setRotatingSecret(true);
     setRotateMsg('');
     try {
-      await fetch('/api/v1/server/rotate-secret', {
-        method: 'POST',
-        headers: { ...authHeaders() },
-      }).then(async (r) => {
-        if (!r.ok) throw new Error(await r.text());
-        return r.json();
-      });
+      await api.rotateFleetSecret();
       setRotateMsg('Secret rotated. Re-forge all agents to reconnect.');
     } catch (e: unknown) {
       setRotateMsg('Rotation failed: ' + (e instanceof Error ? e.message : String(e)));