添加错题删除功能和优化错题列表

**新增功能**:
- 新增删除单个错题的接口 (DELETE /api/wrong-questions/:id)
- 错题列表每个项添加删除按钮
- 支持单独删除不想要的错题记录

**技术实现**:
- 后端: 实现DeleteWrongQuestion处理器，确保用户只能删除自己的错题
- 前端: 添加deleteWrongQuestion API 调用
- UI: 在List.Item中添加actions属性，显示删除按钮
- 删除时显示二次确认弹窗

**注意事项**:
- 删除需要确认，防止误操作
- 删除成功后自动刷新列表
- 仅显示操作用户自己的错题

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

internal/handlers/wrong_question_handler.go

@@ -263,3 +263,41 @@ func GetRandomWrongQuestion(c *gin.Context) {
 		"data":    dto,
 	})
 }
+
+// DeleteWrongQuestion 删除单个错题
+func DeleteWrongQuestion(c *gin.Context) {
+	userID, exists := c.Get("user_id")
+	if !exists {
+		c.JSON(http.StatusUnauthorized, gin.H{
+			"success": false,
+			"message": "未登录",
+		})
+		return
+	}
+
+	wrongQuestionID := c.Param("id")
+	db := database.GetDB()
+
+	// 删除错题（确保只能删除自己的错题）
+	result := db.Where("id = ? AND user_id = ?", wrongQuestionID, userID).Delete(&models.WrongQuestion{})
+	if result.Error != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{
+			"success": false,
+			"message": "删除失败",
+		})
+		return
+	}
+
+	if result.RowsAffected == 0 {
+		c.JSON(http.StatusNotFound, gin.H{
+			"success": false,
+			"message": "错题不存在",
+		})
+		return
+	}
+
+	c.JSON(http.StatusOK, gin.H{
+		"success": true,
+		"message": "已删除",
+	})
+}

main.go

@@ -54,6 +54,7 @@ func main() {
 			auth.GET("/wrong-questions", handlers.GetWrongQuestions)                  // 获取错题列表
 			auth.GET("/wrong-questions/stats", handlers.GetWrongQuestionStats)        // 获取错题统计
 			auth.GET("/wrong-questions/random", handlers.GetRandomWrongQuestion)      // 获取随机错题
+			auth.DELETE("/wrong-questions/:id", handlers.DeleteWrongQuestion)         // 删除单个错题
 			auth.PUT("/wrong-questions/:id/mastered", handlers.MarkWrongQuestionMastered) // 标记已掌握
 			auth.DELETE("/wrong-questions", handlers.ClearWrongQuestions)             // 清空错题本
 		}

web/src/api/question.ts

@@ -57,6 +57,11 @@ export const markWrongQuestionMastered = (id: number) => {
   return request.put<ApiResponse<null>>(`/wrong-questions/${id}/mastered`)
 }
 
+// 删除单个错题
+export const deleteWrongQuestion = (id: number) => {
+  return request.delete<ApiResponse<null>>(`/wrong-questions/${id}`)
+}
+
 // 清空错题本
 export const clearWrongQuestions = () => {
   return request.delete<ApiResponse<null>>('/wrong-questions')

web/src/pages/WrongQuestions.tsx

@@ -67,6 +67,27 @@ const WrongQuestions: React.FC = () => {
     })
   }
 
+  // 删除单个错题
+  const handleDelete = (id: number) => {
+    Modal.confirm({
+      title: '确定要删除这道错题吗？',
+      content: '删除后将无法恢复',
+      okText: '确定',
+      cancelText: '取消',
+      onOk: async () => {
+        try {
+          const res = await questionApi.deleteWrongQuestion(id)
+          if (res.success) {
+            message.success('已删除')
+            loadWrongQuestions()
+          }
+        } catch (error) {
+          message.error('删除失败')
+        }
+      },
+    })
+  }
+
   // 开始错题练习
   const handlePractice = () => {
     // 跳转到答题页面，错题练习模式
@@ -170,7 +191,21 @@ const WrongQuestions: React.FC = () => {
             loading={loading}
             dataSource={wrongQuestions}
             renderItem={(item) => (
-              <List.Item key={item.id} className={styles.listItem}>
+              <List.Item
+                key={item.id}
+                className={styles.listItem}
+                actions={[
+                  <Button
+                    key="delete"
+                    type="text"
+                    danger
+                    icon={<DeleteOutlined />}
+                    onClick={() => handleDelete(item.id)}
+                  >
+                    删除
+                  </Button>
+                ]}
+              >
                 <List.Item.Meta
                   title={
                     <Space>