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>

judge/languages.py

@@ -174,4 +174,6 @@ languages = [
     {"config": _py3_lang_config, "name": "Python3", "description": "Python 3.12", "content_type": "text/x-python"},
     {"config": _go_lang_config, "name": "Golang", "description": "Golang 1.22", "content_type": "text/x-go"},
     {"config": _node_lang_config, "name": "JavaScript", "description": "Node.js 20", "content_type": "text/javascript"},
+    # SQL 题不走外部 judger 沙箱（judge/sql_dispatcher.py 在 worker 内用 sqlite3 判题），config 仅占位
+    {"config": {"template": ""}, "name": "SQL", "description": "SQLite 3", "content_type": "text/x-sql"},
 ]