feat: add Feishu notifier for message notifications

- Implemented a lightweight notification library with support for multiple channels.
- Added FeishuNotifier class to send messages via Feishu webhook.
- Created README documentation for usage and configuration of Feishu notifier.
- Added TypeScript configuration for the project.
- Included a test script for verifying Feishu message notifications.

src/notiify/feishu.ts

@@ -0,0 +1,34 @@
+import { Notification } from '../core/index.ts';
+
+interface FeishuConfig {
+  webhook: string;
+}
+
+export class FeishuNotifier implements Notification {
+  private webhook: string;
+
+  constructor(config: FeishuConfig) {
+    this.webhook = config.webhook;
+  }
+
+  async notify(message: string): Promise<void> {
+    const payload = {
+      msg_type: 'text',
+      content: {
+        text: message,
+      },
+    };
+
+    const response = await fetch(this.webhook, {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+      },
+      body: JSON.stringify(payload),
+    });
+
+    if (!response.ok) {
+      throw new Error(`飞书推送失败: ${response.statusText}`);
+    }
+  }
+}