refactor: 消除课程和套餐状态魔法值，统一使用 CourseStatus 枚举

- 完善 CourseStatus 枚举值：DRAFT, PENDING, REJECTED, PUBLISHED, ARCHIVED, APPROVED
- 替换 CoursePackageService 中的魔法值为 CourseStatus 枚举
- 替换 CourseServiceImpl 中的魔法值为 CourseStatus 枚举
- 替换 TeacherStatsServiceImpl 中的魔法值为 CourseStatus 枚举
- 适配前端状态值，使用大写枚举值

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

reading-platform-java/src/main/java/com/reading/platform/common/enums/CourseStatus.java

@@ -3,14 +3,17 @@ package com.reading.platform.common.enums;
 import lombok.Getter;
 
 /**
- * Course Status Enum
+ * 课程状态枚举
  */
 @Getter
 public enum CourseStatus {
 
-    DRAFT("draft", "Draft"),
-    PUBLISHED("published", "PUBLISHED"),
-    ARCHIVED("archived", "Archived");
+    DRAFT("DRAFT", "草稿"),
+    PENDING("PENDING", "待审核"),
+    REJECTED("REJECTED", "已驳回"),
+    PUBLISHED("PUBLISHED", "已发布"),
+    ARCHIVED("ARCHIVED", "已下架"),
+    APPROVED("APPROVED", "审核通过");
 
     private final String code;
     private final String description;

reading-platform-java/src/main/java/com/reading/platform/service/CoursePackageService.java

@@ -4,6 +4,7 @@ import com.alibaba.fastjson2.JSON;
 import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
 import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
 import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
+import com.reading.platform.common.enums.CourseStatus;
 import com.reading.platform.common.exception.BusinessException;
 import com.reading.platform.common.response.PageResult;
 import com.reading.platform.dto.response.CoursePackageResponse;
@@ -170,7 +171,7 @@ public class CoursePackageService extends ServiceImpl<CoursePackageMapper, Cours
         pkg.setDiscountType(discountType);
         // 存储为 JSON 数组格式
         pkg.setGradeLevels(JSON.toJSONString(gradeLevels));
-        pkg.setStatus("DRAFT");
+        pkg.setStatus(CourseStatus.DRAFT.getCode());
         pkg.setCourseCount(0);
         pkg.setCreatedAt(LocalDateTime.now());
 
@@ -289,7 +290,7 @@ public class CoursePackageService extends ServiceImpl<CoursePackageMapper, Cours
             throw new BusinessException("套餐必须包含至少一个课程包");
         }
 
-        pkg.setStatus("PENDING_REVIEW");
+        pkg.setStatus(CourseStatus.PENDING.getCode());
         pkg.setSubmittedAt(LocalDateTime.now());
         pkg.setSubmittedBy(userId);
         packageMapper.updateById(pkg);
@@ -308,12 +309,12 @@ public class CoursePackageService extends ServiceImpl<CoursePackageMapper, Cours
             throw new BusinessException("套餐不存在");
         }
 
-        if (!"PENDING_REVIEW".equals(pkg.getStatus())) {
+        if (!CourseStatus.PENDING.getCode().equals(pkg.getStatus())) {
             log.warn("套餐审核失败，状态不正确，id={}, status={}", id, pkg.getStatus());
             throw new BusinessException("只有待审核状态的套餐可以审核");
         }
 
-        pkg.setStatus(approved ? "APPROVED" : "REJECTED");
+        pkg.setStatus(approved ? CourseStatus.APPROVED.getCode() : CourseStatus.REJECTED.getCode());
         pkg.setReviewedAt(LocalDateTime.now());
         pkg.setReviewedBy(userId);
         pkg.setReviewComment(comment);
@@ -333,12 +334,12 @@ public class CoursePackageService extends ServiceImpl<CoursePackageMapper, Cours
             throw new BusinessException("套餐不存在");
         }
 
-        if (!"APPROVED".equals(pkg.getStatus())) {
+        if (!CourseStatus.APPROVED.getCode().equals(pkg.getStatus())) {
             log.warn("套餐发布失败，状态不正确，id={}, status={}", id, pkg.getStatus());
             throw new BusinessException("只有已审核通过的套餐可以发布");
         }
 
-        pkg.setStatus("PUBLISHED");
+        pkg.setStatus(CourseStatus.PUBLISHED.getCode());
         pkg.setPublishedAt(LocalDateTime.now());
         packageMapper.updateById(pkg);
         log.info("套餐发布成功，id={}", id);
@@ -356,7 +357,7 @@ public class CoursePackageService extends ServiceImpl<CoursePackageMapper, Cours
             throw new BusinessException("套餐不存在");
         }
 
-        pkg.setStatus("OFFLINE");
+        pkg.setStatus(CourseStatus.ARCHIVED.getCode());
         packageMapper.updateById(pkg);
         log.info("套餐下线成功，id={}", id);
     }

reading-platform-java/src/main/java/com/reading/platform/service/impl/CourseServiceImpl.java

@@ -3,6 +3,7 @@ package com.reading.platform.service.impl;
 import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
 import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
 import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
+import com.reading.platform.common.enums.CourseStatus;
 import com.reading.platform.common.enums.ErrorCode;
 import com.reading.platform.common.exception.BusinessException;
 import com.reading.platform.dto.request.CourseCreateRequest;
@@ -49,7 +50,7 @@ public class CourseServiceImpl extends ServiceImpl<CourseMapper, Course>
         course.setDifficultyLevel(request.getDifficultyLevel());
         course.setDurationMinutes(request.getDurationMinutes());
         course.setObjectives(request.getObjectives());
-        course.setStatus("draft");
+        course.setStatus(CourseStatus.DRAFT.getCode());
         course.setIsSystem(0);
 
         // Course Package Fields
@@ -110,7 +111,7 @@ public class CourseServiceImpl extends ServiceImpl<CourseMapper, Course>
         course.setDifficultyLevel(request.getDifficultyLevel());
         course.setDurationMinutes(request.getDurationMinutes());
         course.setObjectives(request.getObjectives());
-        course.setStatus("draft");
+        course.setStatus(CourseStatus.DRAFT.getCode());
         course.setIsSystem(1);
 
         // Course Package Fields
@@ -357,9 +358,12 @@ public class CourseServiceImpl extends ServiceImpl<CourseMapper, Course>
         // 只过滤系统课程
         wrapper.eq(Course::getIsSystem, 1);
 
-        // 审核管理页：仅返回待审核和已驳回，排除已通过/已发布
+        // 审核管理页：仅过滤待审核和已驳回，排除已通过/已发布
         if (reviewOnly) {
-            wrapper.in(Course::getStatus, List.of("PENDING", "pending", "REJECTED", "rejected"));
+            wrapper.in(Course::getStatus, List.of(
+                CourseStatus.PENDING.getCode(),
+                CourseStatus.REJECTED.getCode()
+            ));
         }
 
         if (StringUtils.hasText(keyword)) {
@@ -394,7 +398,7 @@ public class CourseServiceImpl extends ServiceImpl<CourseMapper, Course>
     @Transactional
     public void publishCourse(Long id) {
         Course course = getCourseById(id);
-        course.setStatus("PUBLISHED");
+        course.setStatus(CourseStatus.PUBLISHED.getCode());
         course.setPublishedAt(LocalDateTime.now());
         courseMapper.updateById(course);
         log.info("课程发布成功：id={}", id);
@@ -404,7 +408,7 @@ public class CourseServiceImpl extends ServiceImpl<CourseMapper, Course>
     @Transactional
     public void archiveCourse(Long id) {
         Course course = getCourseById(id);
-        course.setStatus("archived");
+        course.setStatus(CourseStatus.ARCHIVED.getCode());
         courseMapper.updateById(course);
         log.info("课程归档成功：id={}", id);
     }
@@ -413,10 +417,10 @@ public class CourseServiceImpl extends ServiceImpl<CourseMapper, Course>
     @Transactional
     public void rejectCourse(Long id, String comment) {
         Course course = getCourseById(id);
-        if (!"PENDING".equalsIgnoreCase(course.getStatus()) && !"pending".equals(course.getStatus())) {
+        if (!CourseStatus.PENDING.getCode().equalsIgnoreCase(course.getStatus())) {
             log.warn("课程状态非待审核，无法驳回：id={}, status={}", id, course.getStatus());
         }
-        course.setStatus("REJECTED");
+        course.setStatus(CourseStatus.REJECTED.getCode());
         course.setReviewComment(comment);
         course.setReviewedAt(LocalDateTime.now());
         course.setReviewedBy(1L); // TODO: 从 SecurityUtils 获取当前用户
@@ -433,7 +437,7 @@ public class CourseServiceImpl extends ServiceImpl<CourseMapper, Course>
                                 .or()
                                 .eq(Course::getIsSystem, 1)
                         )
-                        .eq(Course::getStatus, "PUBLISHED")
+                        .eq(Course::getStatus, CourseStatus.PUBLISHED.getCode())
                         .orderByAsc(Course::getName)
         );
     }

reading-platform-java/src/main/java/com/reading/platform/service/impl/TeacherStatsServiceImpl.java

@@ -1,6 +1,7 @@
 package com.reading.platform.service.impl;
 
 import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
+import com.reading.platform.common.enums.CourseStatus;
 import com.reading.platform.entity.Clazz;
 import com.reading.platform.entity.Course;
 import com.reading.platform.entity.Lesson;
@@ -78,7 +79,7 @@ public class TeacherStatsServiceImpl implements TeacherStatsService {
         List<Course> recommendedCourses = courseMapper.selectList(
                 new LambdaQueryWrapper<Course>()
                         .eq(Course::getTenantId, tenantId)
-                        .eq(Course::getStatus, "PUBLISHED")
+                        .eq(Course::getStatus, CourseStatus.PUBLISHED.getCode())
                         .orderByDesc(Course::getUsageCount)
                         .last("LIMIT 5")
         );
@@ -132,7 +133,7 @@ public class TeacherStatsServiceImpl implements TeacherStatsService {
         return courseMapper.selectList(
                 new LambdaQueryWrapper<Course>()
                         .eq(Course::getTenantId, tenantId)
-                        .eq(Course::getStatus, "PUBLISHED")
+                        .eq(Course::getStatus, CourseStatus.PUBLISHED.getCode())
                         .orderByDesc(Course::getUsageCount)
                         .last("LIMIT 10")
         );