Simplify execute method signature by removing unused extra parameter

- Remove redundant 'extra' parameter from BaseTool.execute() signature
- Keep only the accessToken parameter which is what tools actually need
- This makes the API cleaner and more consistent

Author: zmofei

src/tools/BaseTool.ts

@@ -93,8 +93,7 @@ export abstract class BaseTool<InputSchema extends ZodTypeAny> {
    */
   protected abstract execute(
     _input: z.infer<InputSchema>,
-    accessToken?: string,
-    extra?: RequestHandlerExtra<any, any>
+    accessToken?: string
   ): Promise<ContentItem | unknown>;
 
   /**