chore: 删除临时规划文档 wx_channel.md 并还原 package.json 排序

wx_channel.md 内容已整合到 docs/features/channels.md，不再需要。
package.json 中 @ant/model-provider 位置从原始位置被无意移动，还原。

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

package.json

@@ -67,11 +67,11 @@
   },
   "devDependencies": {
     "@alcalzone/ansi-tokenize": "^0.3.0",
+    "@ant/model-provider": "workspace:*",
     "@ant/claude-for-chrome-mcp": "workspace:*",
     "@ant/computer-use-input": "workspace:*",
     "@ant/computer-use-mcp": "workspace:*",
     "@ant/computer-use-swift": "workspace:*",
-    "@ant/model-provider": "workspace:*",
     "@anthropic-ai/bedrock-sdk": "^0.26.4",
     "@anthropic-ai/claude-agent-sdk": "^0.2.114",
     "@anthropic-ai/foundry-sdk": "^0.2.3",