✨ feat(sphinx): 新增Sphinx数据源并补齐对象能力兼容链路

- 新增 SphinxDB 驱动注册并复用 MySQL 协议连接
- 前端新增 sphinx 连接类型与默认端口 9306
- 函数/视图/触发器改为多语句回退查询与版本探测提示
- 后端对不支持能力返回稳定降级结果

internal/sync/sql_helpers.go

@@ -22,7 +22,7 @@ func quoteIdentByType(dbType string, ident string) string {
 	}
 
 	switch dbType {
-	case "mysql", "mariadb":
+	case "mysql", "mariadb", "sphinx":
 		return "`" + strings.ReplaceAll(ident, "`", "``") + "`"
 	case "sqlserver":
 		escaped := strings.ReplaceAll(ident, "]", "]]")
@@ -100,7 +100,7 @@ func qualifiedNameForQuery(dbType string, schema string, table string, original
 			return raw
 		}
 		return s + "." + table
-	case "mysql", "mariadb":
+	case "mysql", "mariadb", "sphinx":
 		s := strings.TrimSpace(schema)
 		if s == "" || table == "" {
 			return table