refactor: 统一业务异常处理，标准化结果码和错误响应

1.  新增并完善ResultCode枚举，补充标准HTTP状态码对应的业务状态码
2.  重构BusinessException，新增基于ResultCode的构造函数和ThrowIf扩展方法
3.  替换所有硬编码的HTTP状态码为统一的ResultCode枚举
4.  优化全局异常中间件，根据业务状态码映射对应HTTP状态码并规范化JSON响应
5.  修复OssImageHelper和AutoDotCodeConsumer中的OSS文件处理逻辑
6.  新增用户答题快照实体类
7.  清理废弃的宠物模块迁移脚本

QYZH.InteractiveMagazine.Service/PointsService.cs

@@ -28,7 +28,7 @@ public class PointsService(
             input.UserId, input.Amount, input.ChangeType);
 
         if (input.Amount <= 0)
-            throw new BusinessException("增加积分数量必须大于0", 400);
+            throw new BusinessException("增加积分数量必须大于0", ResultCode.BAD_REQUEST);
 
         AddPointsOutput result = null!;
 
@@ -49,7 +49,7 @@ public class PointsService(
             input.UserId, input.Amount, input.ChangeType);
 
         if (input.Amount <= 0)
-            throw new BusinessException("扣除积分数量必须大于0", 400);
+            throw new BusinessException("扣除积分数量必须大于0", ResultCode.BAD_REQUEST);
 
         DeductPointsOutput result = null!;
 
@@ -71,7 +71,7 @@ public class PointsService(
     public async Task<AddPointsOutput> AddPointsInTranAsync(AddPointsInput input)
     {
         if (input.Amount <= 0)
-            throw new BusinessException("增加积分数量必须大于0", 400);
+            throw new BusinessException("增加积分数量必须大于0", ResultCode.BAD_REQUEST);
 
         // 查询用户当前积分
         var user = await Context.Queryable<Users>()
@@ -79,7 +79,7 @@ public class PointsService(
             .FirstAsync();
 
         if (user == null)
-            throw new BusinessException("用户不存在", 404);
+            throw new BusinessException("用户不存在", ResultCode.NOT_FOUND);
 
         var previousBalance = user.Points;
         var newBalance = previousBalance + input.Amount;
@@ -129,7 +129,7 @@ public class PointsService(
     public async Task<DeductPointsOutput> DeductPointsInTranAsync(DeductPointsInput input)
     {
         if (input.Amount <= 0)
-            throw new BusinessException("扣除积分数量必须大于0", 400);
+            throw new BusinessException("扣除积分数量必须大于0", ResultCode.BAD_REQUEST);
 
         // 查询用户当前积分
         var user = await Context.Queryable<Users>()
@@ -137,13 +137,13 @@ public class PointsService(
             .FirstAsync();
 
         if (user == null)
-            throw new BusinessException("用户不存在", 404);
+            throw new BusinessException("用户不存在", ResultCode.NOT_FOUND);
 
         var previousBalance = user.Points;
 
         // 余额不足校验
         if (previousBalance < input.Amount)
-            throw new BusinessException($"积分不足，需要 {input.Amount} 积分，当前余额 {previousBalance}", 400);
+            throw new BusinessException($"积分不足，需要 {input.Amount} 积分，当前余额 {previousBalance}", ResultCode.BAD_REQUEST);
 
         var newBalance = previousBalance - input.Amount;
 
@@ -214,7 +214,7 @@ public class PointsService(
             .FirstAsync();
 
         if (user == null)
-            throw new BusinessException("用户不存在", 404);
+            throw new BusinessException("用户不存在", ResultCode.NOT_FOUND);
 
         // 查询累计收入（Income 类型）
         var totalIncome = await Context.Queryable<PointsRecord>()
@@ -241,10 +241,10 @@ public class PointsService(
     public async Task<PageListModel<PointsRecordOutput>> GetPointsRecordsAsync(PointsRecordQueryInput input)
     {
         if (input.PageIndex <= 0)
-            throw new BusinessException("页码必须大于0", 400);
+            throw new BusinessException("页码必须大于0", ResultCode.BAD_REQUEST);
 
         if (input.PageSize <= 0 || input.PageSize > 100)
-            throw new BusinessException("每页条数必须在1-100之间", 400);
+            throw new BusinessException("每页条数必须在1-100之间", ResultCode.BAD_REQUEST);
 
         var query = Context.Queryable<PointsRecord>()
             .Where(r => r.UserId == input.UserId && !r.IsDeleted)