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.

kevisual.json

@@ -0,0 +1,22 @@
+{
+  "metadata": {
+    "name": "kevisual",
+    "share": "public"
+  },
+  "registry": "https://kevisual.cn/root/ai/kevisual/backend/simple-bun",
+  "clone": {
+    ".": {
+      "enabled": true
+    }
+  },
+  "syncd": [
+    {
+      "files": [
+        "**/*"
+      ],
+      "registry": ""
+    }
+  ],
+  "sync": {
+  }
+}