新增 SQL 题型：SQLite 内联判题（不依赖外部沙箱）

- SQL 作为语言接入现有提交流程，judge_task 按 language 分流到 SQLJudgeDispatcher
- judge/sql_runner.py：内存 SQLite 判题核心，查询题比结果集/增删改题比表状态，
  authorizer + progress_handler + max_page_count 三重防护
- dispatcher 提取 _process_judge_result/_push_status 供 SQL 判题复用（行为不变）
- 测试点通道支持 1.sql..N.sql 压缩包，出题只需数据脚本+标准答案
- Problem 增加 sql_config 字段；options 数据迁移注册 SQL 语言

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

problem/serializers.py

@@ -37,6 +37,11 @@ class CreateProblemCodeTemplateSerializer(serializers.Serializer):
     pass
 
 
+class SQLConfigSerializer(serializers.Serializer):
+    mode = serializers.ChoiceField(choices=["query", "modify"])
+    order_sensitive = serializers.BooleanField(default=False)
+
+
 class ProblemIOModeSerializer(serializers.Serializer):
     io_mode = serializers.ChoiceField(choices=ProblemIOMode.choices)
     input = serializers.CharField()
@@ -89,6 +94,9 @@ class CreateOrEditProblemSerializer(serializers.Serializer):
     # AST 规则
     ast_rules = serializers.JSONField(required=False, allow_null=True, default=None)
 
+    # SQL 题配置
+    sql_config = SQLConfigSerializer(required=False, allow_null=True, default=None)
+
 
 class CreateProblemSerializer(CreateOrEditProblemSerializer):
     pass