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

src/core/proactive/proactive.ts

@@ -0,0 +1,49 @@
+// 主动服务系统
+export interface ScheduledTask {
+  id: string;
+  userId: string;
+  channel: string;
+  schedule: {
+    type: 'once' | 'daily' | 'weekly' | 'cron';
+    time: string;
+    timezone: string;
+  };
+  task: {
+    type: string;
+    prompt: string;
+  };
+  status: 'active' | 'paused' | 'completed';
+  lastRun?: Date;
+  nextRun?: Date;
+}
+
+export class ProactiveServiceSystem {
+  private tasks: Map<string, ScheduledTask> = new Map();
+  private cronJobs: Map<string, any> = new Map();
+
+  async scheduleTask(task: ScheduledTask): Promise<void> {
+    task.id = task.id || this.generateId();
+    task.status = 'active';
+    
+    this.tasks.set(task.id, task);
+    
+    // TODO: 使用 node-cron 设置定时任务（后续实现）
+    console.log([Proactive] Task scheduled: );
+  }
+
+  async cancelTask(taskId: string): Promise<void> {
+    const task = this.tasks.get(taskId);
+    if (task) {
+      task.status = 'paused';
+      // TODO: 取消 cron job
+    }
+  }
+
+  async listTasks(userId: string): Promise<ScheduledTask[]> {
+    return Array.from(this.tasks.values()).filter(t => t.userId === userId);
+  }
+
+  private generateId(): string {
+    return cron__;
+  }
+}