feat(product-gift): 新增管理端赠品配置接口（/api/admin/product-gift/save + /list）

cfc-backend/src/main/java/com/etotem/cfc/controller/admin/AdminProductGiftController.java

@@ -0,0 +1,58 @@
+package com.etotem.cfc.controller.admin;
+
+import com.etotem.cfc.common.Result;
+import com.etotem.cfc.dto.GiftConfigVO;
+import com.etotem.cfc.dto.ProductGiftItemDTO;
+import com.etotem.cfc.service.ProductGiftService;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import javax.annotation.Resource;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+@RestController
+@RequestMapping("/api/admin/product-gift")
+public class AdminProductGiftController {
+
+    @Resource
+    private ProductGiftService giftService;
+
+    /** 保存某商品某等级的赠品配置（幂等：先删后插） */
+    @PostMapping("/save")
+    public Result<Void> save(@RequestBody Map<String, Object> params) {
+        Long productId = Long.parseLong(params.get("productId").toString());
+        String levelCode = params.get("levelCode").toString();
+        Integer status = Integer.parseInt(params.get("status").toString());
+        @SuppressWarnings("unchecked")
+        List<Map<String, Object>> itemsMap = (List<Map<String, Object>>) params.get("items");
+        List<ProductGiftItemDTO> items = null;
+        if (itemsMap != null) {
+            items = new ArrayList<>();
+            for (Map<String, Object> m : itemsMap) {
+                ProductGiftItemDTO dto = new ProductGiftItemDTO();
+                Object id = m.get("id");
+                dto.setId(id != null ? Long.parseLong(id.toString()) : null);
+                dto.setGiftType((String) m.get("giftType"));
+                Object gpId = m.get("giftProductId");
+                dto.setGiftProductId(gpId != null ? Long.parseLong(gpId.toString()) : null);
+                Object cf = m.get("cfValue");
+                dto.setCfValue(cf != null ? Integer.parseInt(cf.toString()) : 0);
+                Object sort = m.get("sortOrder");
+                dto.setSortOrder(sort != null ? Integer.parseInt(sort.toString()) : 0);
+                items.add(dto);
+            }
+        }
+        return giftService.saveGiftConfig(productId, levelCode, status, items);
+    }
+
+    /** 查询某商品的全部等级赠品配置（管理端回显） */
+    @PostMapping("/list")
+    public Result<List<GiftConfigVO>> list(@RequestBody Map<String, Object> params) {
+        Long productId = Long.parseLong(params.get("productId").toString());
+        return Result.success(giftService.listConfigsByProduct(productId));
+    }
+}