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>

mobile/README.md

@@ -0,0 +1,39 @@
+# Biz Connect — Mobile app (Capacitor)
+
+A Capacitor shell that loads the live Connect web UI (`server.url` in
+`capacitor.config.json`) and adds native push, camera/mic, and store distribution. See the
+overall plan in [../CLIENTS.md](../CLIENTS.md).
+
+## Prerequisites
+- Node + `npm install` here.
+- **Android:** Android Studio + SDK.
+- **iOS:** macOS + Xcode (+ an Apple Developer account to run on device / ship).
+
+## Setup
+```bash
+npm install
+npx cap add android
+npx cap add ios          # macOS only
+npx cap sync
+```
+
+## Run / build
+```bash
+npx cap open android     # build & run from Android Studio
+npx cap open ios         # build & run from Xcode
+```
+
+## Server origin
+The app loads `server.url` from `capacitor.config.json` (default
+`https://remote.bizgaze.com`). For a local device test against a dev server, set it to your
+machine's LAN URL (and allow cleartext for plain http).
+
+## Native push (next step)
+Native push uses the Capacitor Push Notifications plugin (FCM on Android, APNs on iOS) and a
+server endpoint to register device tokens — tracked in [../CLIENTS.md](../CLIENTS.md) Phase B.
+This is separate from the existing Web Push (VAPID) the PWA already uses. Needs Google/Apple
+credentials to test end-to-end.
+
+## Shipping (gated on accounts)
+- **Google Play:** one-time $25; upload an AAB; signing key.
+- **App Store:** Apple Developer $99/yr; archive via Xcode; App Store Connect listing.