feat(clients): scaffold mobile (Capacitor) + desktop (Electron) shells

Plan + decisions in CLIENTS.md (parallel mobile+desktop; desktop = technician
client + existing remote-control agent host; mobile = Capacitor wrap).

- desktop/: Electron technician client — loads the live Connect UI, native
  screen capture via setDisplayMediaRequestHandler, persisted session, external
  links to browser; electron-builder config for Win/Mac/Linux installers.
- mobile/: Capacitor project — server.url loads Connect UI, push/camera/status-bar
  plugins declared, www splash fallback; iOS/Android added via `cap add`.
- Reuses the existing /api/v1 + Bearer auth backend; no web-code changes.
- .gitignore: ignore generated mobile/android, mobile/ios platform dirs.

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

desktop/package.json

@@ -0,0 +1,22 @@
+{
+  "name": "biz-connect-desktop",
+  "version": "0.1.0",
+  "description": "Biz Connect technician desktop client — loads the Connect web UI with native screen capture",
+  "main": "main.js",
+  "scripts": {
+    "start": "electron .",
+    "dist": "electron-builder"
+  },
+  "devDependencies": {
+    "electron": "^31.0.0",
+    "electron-builder": "^24.13.3"
+  },
+  "build": {
+    "appId": "com.bizgaze.connect.desktop",
+    "productName": "Biz Connect",
+    "files": ["main.js", "preload.js", "assets/**"],
+    "win": { "target": "nsis" },
+    "mac": { "target": "dmg", "category": "public.app-category.business" },
+    "linux": { "target": "AppImage" }
+  }
+}