feat: real-time messaging, Electron desktop app, admin drive portal

Messaging:
- Optimistic UI: message appears instantly in sender's view on send
- Skip WS relay-back of own messages to avoid duplicates
- Fix sent_at field name mismatch (sentAt → sent_at fallback)

Admin portal:
- /admin route: list all users, storage used vs quota, file count
- Inline-edit per-user storage quota (MB) and admin flag
- Stats header: total users, total storage, total files
- is_admin + storage_quota_mb columns added to users table
- Login response now includes isAdmin; sidebar shows Admin link for admins
- requireAdmin middleware on all /admin/* routes

Electron desktop app (desktop/):
- BrowserWindow with native title bar, system tray, hide-to-tray on close
- First-run setup dialog to configure self-hosted server URL
- Persists server URL via electron-store
- Tray menu: Open, Change server URL, Quit
- IPC: showNotification for future native push notifications
- electron-builder config for macOS (DMG), Windows (NSIS), Linux (AppImage)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

desktop/preload.js

@@ -0,0 +1,13 @@
+'use strict';
+
+const { contextBridge, ipcRenderer } = require('electron');
+
+contextBridge.exposeInMainWorld('cloudlink', {
+  getServerUrl: () => ipcRenderer.invoke('get-server-url'),
+  setServerUrl: (url) => ipcRenderer.invoke('set-server-url', url),
+  showNotification: (title, body) =>
+    ipcRenderer.invoke('show-notification', { title, body }),
+  // Platform detection for the web app
+  platform: process.platform,
+  isDesktop: true,
+});