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.

tsconfig.json

@@ -0,0 +1,24 @@
+{
+  "extends": "@kevisual/types/json/backend.json",
+  "compilerOptions": {
+    "module": "NodeNext",
+    "target": "esnext",
+    "baseUrl": ".",
+    "typeRoots": [
+      "./node_modules/@types",
+      "./node_modules/@kevisual/types/index.d.ts"
+    ],
+    "paths": {
+      "@/*": [
+        "src/*"
+      ],
+      "@agent/*": [
+        "agent/*"
+      ]
+    },
+  },
+  "include": [
+    "src/**/*",
+    "agent/**/*",
+  ],
+}