feat(mall): 添加小程序装修页面控制器

- 新增 MiniDiyPageController 类用于处理小程序装修页面相关接口
- 实现 getMiniDiyPage 接口获取diy装修页面数据

ruoyi-modules/ruoyi-mall/src/main/java/org/dromara/mall/controller/mini/MiniDiyPageController.java

@@ -0,0 +1,43 @@
+package org.dromara.mall.controller.mini;
+
+import com.baomidou.mybatisplus.core.toolkit.Wrappers;
+import lombok.RequiredArgsConstructor;
+import org.dromara.common.core.domain.R;
+import org.dromara.common.web.core.BaseController;
+import org.dromara.mall.domain.NsDiyPage;
+import org.dromara.mall.service.INsDiyPageService;
+import org.springframework.validation.annotation.Validated;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+/**
+ * mini装修页面
+ * 前端访问路由地址为:/mall/miniDiyPcPage
+ *
+ * @author LionLi
+ * @date 2026-04-21
+ */
+@Validated
+@RequiredArgsConstructor
+@RestController
+@RequestMapping("/miniDiyPcPage")
+public class MiniDiyPageController extends BaseController {
+
+    private final INsDiyPageService nsDiyPageService;
+
+    /**
+     * 获取diy装修页面
+     */
+    @GetMapping("/getMiniDiyPage")
+    public R<NsDiyPage> getMiniDiyPage(@RequestParam(value = "type", required = false) String type) {
+        NsDiyPage one = nsDiyPageService.getOne(
+            Wrappers.lambdaQuery(NsDiyPage.class)
+                .eq(NsDiyPage::getIsDefault, 1)
+                .eq(NsDiyPage::getType, type)
+                .last("limit 1")
+        );
+        return R.ok(one);
+    }
+}