🐛 fix(ai-safety): 修正完全模式执行口径与本地工具失败判定

- 修正完全模式下 DML 与过程调用的安全提示和限制说明
- 区分连接探针失败与可恢复 SQL 执行错误，避免数据探针被误终止
- 修复本地 execute_sql 写语句结果返回 affectedRows
- 补充 AI 安全、本地工具执行与 SQL 限制回归测试

frontend/src/utils/aiSqlLimit.test.ts

@@ -22,6 +22,11 @@ describe('buildAIReadonlyPreviewSQL', () => {
       .toBe('SELECT * FROM (SELECT 1 FROM DUAL) WHERE ROWNUM <= 50');
   });
 
+  it('treats OceanBase Oracle as Oracle dialect when building readonly preview SQL', () => {
+    expect(buildAIReadonlyPreviewSQL('oceanbase', 'SELECT 1 FROM DUAL;', 50, 'oceanbase', { oceanBaseProtocol: 'oracle' }))
+      .toBe('SELECT * FROM (SELECT 1 FROM DUAL) WHERE ROWNUM <= 50');
+  });
+
   it('keeps MySQL-family SQL on LIMIT syntax', () => {
     expect(buildAIReadonlyPreviewSQL('mysql', 'SELECT * FROM users', 50))
       .toBe('SELECT * FROM users LIMIT 50 OFFSET 0');

frontend/src/utils/aiSqlLimit.ts

@@ -20,10 +20,16 @@ const hasExistingRowLimit = (dialect: string, sql: string): boolean => {
   return (dialect === 'oracle' || dialect === 'dameng') && /\brownum\b/.test(text);
 };
 
-export const buildAIReadonlyPreviewSQL = (dbType: string, sql: string, limit = 50, driver = ''): string => {
+export const buildAIReadonlyPreviewSQL = (
+  dbType: string,
+  sql: string,
+  limit = 50,
+  driver = '',
+  options?: { oceanBaseProtocol?: unknown },
+): string => {
   const baseSQL = trimSQLStatement(sql);
   const safeLimit = Math.max(0, Math.floor(Number(limit) || 0));
-  const dialect = resolveSqlDialect(dbType, driver);
+  const dialect = resolveSqlDialect(dbType, driver, options);
   if (!baseSQL || safeLimit <= 0 || !isAIReadonlySQL(baseSQL) || hasExistingRowLimit(dialect, baseSQL)) {
     return baseSQL;
   }