feat: add integrated terminal with tab system and theme support

- Add terminal view with draggable split panels and multi-tab support
- Implement terminal WebSocket server with password protection
- Add per-terminal font size that persists when moving between tabs
- Support all 12 app themes with matching terminal colors
- Add keyboard shortcut (Ctrl+`) to toggle terminal view
- Include scrollback buffer for session history on reconnect

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/server/package.json

@@ -16,6 +16,7 @@
     "cors": "^2.8.5",
     "dotenv": "^17.2.3",
     "express": "^5.1.0",
+    "node-pty": "^1.0.0",
     "ws": "^8.18.0"
   },
   "devDependencies": {