feat(api): 改版v1 管理端问题域CRUD (W1)

AdminProblemDomainController: /api/admin/problem-domain 的 list/save/delete。支持状态过滤、编码唯一性校验、全字段(含7步流程JSON/调研模板/推荐产品/任务模板包/奖励CF值)。

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

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

@@ -0,0 +1,93 @@
+package com.etotem.cfc.controller.admin;
+
+import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
+import com.etotem.cfc.common.Result;
+import com.etotem.cfc.entity.ProblemDomain;
+import com.etotem.cfc.mapper.ProblemDomainMapper;
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.tags.Tag;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestAttribute;
+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.Date;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * 管理端-问题域 CRUD（改版v1，W1）
+ */
+@Tag(name = "管理端-问题域", description = "问题域 CRUD 管理")
+@RestController
+@RequestMapping("/api/admin/problem-domain")
+public class AdminProblemDomainController {
+
+    @Resource
+    private ProblemDomainMapper problemDomainMapper;
+
+    @Operation(summary = "问题域列表（含停用，管理端）")
+    @PostMapping("/list")
+    public Result<List<ProblemDomain>> list(@RequestBody Map<String, Object> params) {
+        LambdaQueryWrapper<ProblemDomain> wrapper = new LambdaQueryWrapper<ProblemDomain>()
+                .orderByAsc(ProblemDomain::getSortOrder)
+                .orderByAsc(ProblemDomain::getId);
+        // 可选状态过滤
+        if (params != null && params.get("status") != null) {
+            wrapper.eq(ProblemDomain::getStatus, Integer.parseInt(params.get("status").toString()));
+        }
+        return Result.success(problemDomainMapper.selectList(wrapper));
+    }
+
+    @Operation(summary = "新增/更新问题域")
+    @PostMapping("/save")
+    public Result<ProblemDomain> save(@RequestBody ProblemDomain domain, @RequestAttribute("userId") Long userId) {
+        if (domain.getCode() == null || domain.getCode().isEmpty()) {
+            return Result.error("编码不能为空");
+        }
+        if (domain.getName() == null || domain.getName().isEmpty()) {
+            return Result.error("名称不能为空");
+        }
+        // 编码唯一性校验
+        ProblemDomain exists = problemDomainMapper.selectOne(
+                new LambdaQueryWrapper<ProblemDomain>()
+                        .eq(ProblemDomain::getCode, domain.getCode())
+                        .last("LIMIT 1"));
+        if (exists != null && (domain.getId() == null || !exists.getId().equals(domain.getId()))) {
+            return Result.error("编码已存在: " + domain.getCode());
+        }
+
+        Date now = new Date();
+        if (domain.getId() == null) {
+            if (domain.getStatus() == null) {
+                domain.setStatus(1);
+            }
+            if (domain.getRewardCfValue() == null) {
+                domain.setRewardCfValue(0);
+            }
+            if (domain.getSortOrder() == null) {
+                domain.setSortOrder(0);
+            }
+            domain.setCreatedAt(now);
+            domain.setUpdatedAt(now);
+            problemDomainMapper.insert(domain);
+        } else {
+            domain.setUpdatedAt(now);
+            problemDomainMapper.updateById(domain);
+        }
+        return Result.success(domain);
+    }
+
+    @Operation(summary = "删除问题域")
+    @PostMapping("/delete")
+    public Result<Void> delete(@RequestBody Map<String, Object> params, @RequestAttribute("userId") Long userId) {
+        Long id = params.get("id") != null ? Long.valueOf(params.get("id").toString()) : null;
+        if (id == null) {
+            return Result.error("缺少 id");
+        }
+        problemDomainMapper.deleteById(id);
+        return Result.success(null);
+    }
+}