refactor(acp): migrate to @agentclientprotocol/sdk and clean up handlers

- Replace deprecated ACP session manager with new SDK integration
- Add acpFileHandler test coverage
- Remove obsolete acpMessageHandler and acpSessionManager
- Update type definitions and connection handlers
- Apply code formatting fixes

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

package-lock.json

@@ -14293,7 +14293,6 @@
       "os": [
         "darwin"
       ],
-      "peer": true,
       "engines": {
         "node": "^8.16.0 || ^10.6.0 || >=11.0.0"
       }
@@ -22904,6 +22903,7 @@
       "version": "0.12.0",
       "license": "LICENSE",
       "dependencies": {
+        "@agentclientprotocol/sdk": "^0.14.1",
         "@modelcontextprotocol/sdk": "^1.25.1",
         "@qwen-code/webui": "*",
         "cors": "^2.8.5",