feat(channels): add DingTalk channel adapter

- Add @qwen-code/channel-dingtalk package with stream-based bot integration
- Support clientId/clientSecret authentication for DingTalk
- Add message deduplication and group chat mention handling
- Update ChannelConfig type to include dingtalk channel type

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

packages/channels/dingtalk/package.json

@@ -0,0 +1,18 @@
+{
+  "name": "@qwen-code/channel-dingtalk",
+  "version": "0.1.0",
+  "description": "DingTalk channel adapter for Qwen Code",
+  "type": "module",
+  "main": "src/index.ts",
+  "types": "src/index.ts",
+  "exports": {
+    ".": "./src/index.ts"
+  },
+  "dependencies": {
+    "@qwen-code/channel-base": "file:../base",
+    "dingtalk-stream-sdk-nodejs": "^2.0.4"
+  },
+  "devDependencies": {
+    "typescript": "^5.0.0"
+  }
+}