【功能修改】IoT：更新问候语打印方法，返回问候语数量；删除不再使用的插件控制器和配置类

yudao-module-iot/yudao-module-iot-biz/src/main/java/cn/iocoder/yudao/module/iot/controller/admin/plugininfo/Greetings.java

@@ -30,11 +30,12 @@ public class Greetings {
     @Autowired
     private List<Greeting> greetings;
 
-    public void printGreetings() {
+    public Integer printGreetings() {
         System.out.printf("找到扩展点的 %d 个扩展 '%s'%n", greetings.size(), Greeting.class.getName());
         for (Greeting greeting : greetings) {
             System.out.println(">>> " + greeting.getGreeting());
         }
+        return greetings.size();
     }
 
-}
+}

yudao-module-iot/yudao-module-iot-biz/src/main/java/cn/iocoder/yudao/module/iot/controller/admin/plugininfo/PluginController.java

@@ -123,12 +123,12 @@ public class PluginController {
     /**
      * 打印问候语
      *
-     * @return 1
+     * @return 问候语数量
      */
     @PermitAll
     @GetMapping("/printGreetings")
     public ResponseEntity<Integer> printGreetings() {
-        greetings.printGreetings();
-        return ResponseEntity.ok(1);
+        Integer count = greetings.printGreetings();
+        return ResponseEntity.ok(count);
     }
 }