feat(mcp): add McpTool extension point and built-in tools #330

- Introduce McpTool extension point for dynamic tool registration.
- Add McpToolManager to manage built-in and extension-provided tools.
- Implement 20+ built-in tools for file, text, and project operations.

Author: phodal

core/src/233/main/resources/META-INF/autodev-core.xml

@@ -220,6 +220,11 @@
         <extensionPoint qualifiedName="cc.unitmesh.knowledgeWebApiProvide"
                         interface="cc.unitmesh.devti.bridge.provider.KnowledgeWebApiProvider"
                         dynamic="true"/>
+
+        <!-- mcp -->
+        <extensionPoint qualifiedName="cc.unitmesh.mcpTool"
+                        interface="cc.unitmesh.devti.mcp.McpTool"
+                        dynamic="true"/>
     </extensionPoints>
 
     <applicationListeners>