feat: initialize ZCLAW project with core systems and Tauri desktop

- Created backend core systems:
  - Remote Execution System (远程执行系统)
  - Task Orchestration Engine (任务编排引擎)
  - Persistent Memory System (持续记忆系统)
  - Proactive Service System (主动服务系统)

- Created Tauri desktop app:
  - Three-column layout based on AutoClaw design
  - React + TypeScript + Tailwind CSS
  - Zustand state management
  - Lucide React icons

- Components:
  - Sidebar (Agent list, IM channels, scheduled tasks)
  - ChatArea (Chat interface with message bubbles)
  - RightPanel (Task progress, statistics, next actions)

Next: Test Tauri dev server and integrate with OpenClaw backend

desktop/src/index.css

@@ -0,0 +1,48 @@
+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+
+@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&display=swap');
+
+body {
+  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
+  background-color: #f9fafb;
+}
+
+.custom-scrollbar::-webkit-scrollbar {
+  width: 6px;
+}
+.custom-scrollbar::-webkit-scrollbar-track {
+  background: transparent;
+}
+.custom-scrollbar::-webkit-scrollbar-thumb {
+  background: #d1d5db;
+  border-radius: 3px;
+}
+
+.agent-avatar {
+  background: linear-gradient(135deg, #f97316 0%, #ea580c 100%);
+}
+
+.chat-bubble-assistant {
+  background: white;
+  border: 1px solid #e5e7eb;
+  border-radius: 12px;
+  border-bottom-left-radius: 4px;
+}
+
+.chat-bubble-user {
+  background: #f97316;
+  color: white;
+  border-radius: 12px;
+  border-bottom-right-radius: 4px;
+}
+
+.thinking-dot {
+  animation: pulse 1.5s infinite;
+}
+
+@keyframes pulse {
+  0%, 100% { opacity: 0.4; }
+  50% { opacity: 1; }
+}