fix: 修复readServiceMethodSignature - 正确构造Service文件路径

🐛 Bug:
- findServiceFile期望字符串参数，但传入了对象
- 代码逻辑重复

✅ 修复:
- 从methodServiceCalls提取serviceImplName
- 正确调用findServiceFile(serviceImplName + '.service.ts')
- 删除重复的代码逻辑

wwjcloud-nest-v1/tools/java-to-nestjs-migration/generators/controller-generator.js

@@ -616,16 +616,7 @@ ${methodBody}
    */
   readServiceMethodSignature(method, javaController) {
     try {
-      // 获取Service文件路径
-      const servicePath = this.findServiceFile(javaController);
-      if (!servicePath || !fs.existsSync(servicePath)) {
-        return null;
-      }
-
-      // 读取Service文件内容
-      const serviceContent = fs.readFileSync(servicePath, 'utf-8');
-      
-      // 从methodServiceCalls中获取实际调用的Service方法名
+      // 从methodServiceCalls中获取实际调用的Service名称
       const javaMethodName = method.javaMethodName;
       const methodServiceCalls = javaController.methodServiceCalls || {};
       const serviceCalls = methodServiceCalls[javaMethodName] || [];
@@ -634,6 +625,24 @@ ${methodBody}
         return null;
       }
       
+      const serviceImplName = serviceCalls[0].serviceImpl;
+      
+      // 获取Service文件的相对路径
+      const serviceRelPath = this.findServiceFile(serviceImplName + '.service.ts');
+      if (!serviceRelPath) {
+        return null;
+      }
+      
+      // 构造完整路径
+      const servicePath = path.join(this.outputDir, 'services', serviceRelPath);
+      if (!fs.existsSync(servicePath)) {
+        return null;
+      }
+
+      // 读取Service文件内容
+      const serviceContent = fs.readFileSync(servicePath, 'utf-8');
+      
+      // 获取Service方法名（已经在上面获取了serviceCalls）
       const serviceMethodName = serviceCalls[0].serviceMethod;
       
       // 提取方法签名：async methodName(param1: Type1, param2: Type2): Promise<ReturnType>