feat(backend): 管理端商品选择器 API /api/admin/product/linked/list

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

@@ -0,0 +1,59 @@
+package com.etotem.cfc.controller.admin;
+
+import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
+import com.baomidou.mybatisplus.core.metadata.IPage;
+import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
+import com.etotem.cfc.common.Result;
+import com.etotem.cfc.entity.Product;
+import com.etotem.cfc.mapper.ProductMapper;
+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.HashMap;
+import java.util.Map;
+
+@RestController
+@RequestMapping("/api/admin/product")
+public class AdminProductPickerController {
+
+    @Resource
+    private ProductMapper productMapper;
+
+    @PostMapping("/linked/list")
+    public Result<Map<String, Object>> linkedList(@RequestBody Map<String, Object> params) {
+        Long productId = params.get("productId") != null ? Long.valueOf(params.get("productId").toString()) : null;
+        Long categoryId = params.get("categoryId") != null ? Long.valueOf(params.get("categoryId").toString()) : null;
+        String keyword = (String) params.get("keyword");
+        Integer page = params.get("page") != null ? Integer.valueOf(params.get("page").toString()) : 1;
+        Integer pageSize = params.get("pageSize") != null ? Integer.valueOf(params.get("pageSize").toString()) : 20;
+
+        // 同分类限制：只返回同一分类的商品
+        if (categoryId == null && productId != null) {
+            Product product = productMapper.selectById(productId);
+            if (product != null) {
+                categoryId = product.getCategoryId();
+            }
+        }
+
+        LambdaQueryWrapper<Product> wrapper = new LambdaQueryWrapper<>();
+        wrapper.eq(Product::getStatus, "on_shelf");
+        if (categoryId != null) {
+            wrapper.eq(Product::getCategoryId, categoryId);
+        }
+        if (keyword != null && !keyword.trim().isEmpty()) {
+            wrapper.like(Product::getName, keyword.trim());
+        }
+
+        IPage<Product> pageResult = productMapper.selectPage(new Page<>(page, pageSize), wrapper);
+
+        Map<String, Object> result = new HashMap<>();
+        result.put("list", pageResult.getRecords());
+        result.put("total", pageResult.getTotal());
+        result.put("page", page);
+        result.put("pageSize", pageSize);
+        return Result.success(result);
+    }
+}