♻️ refactor(oceanbase): 完善双协议连接链路

- 抽象 OceanBase 协议解析与运行态参数注入
- 复用 OracleDB 实现 OceanBase Oracle 租户连接能力
- 调整 DDL、schema、SQL 方言和数据源能力判断
- 补充协议优先级、缓存隔离和 RPC 参数测试
- 支持按指定 driver 自动生成 agent revision

frontend/src/utils/dataSourceCapabilities.test.ts

@@ -29,4 +29,15 @@ describe('dataSourceCapabilities', () => {
       supportsApproximateTotalPages: false,
     });
   });
+
+  it('treats OceanBase Oracle protocol as Oracle capabilities', () => {
+    expect(getDataSourceCapabilities({
+      type: 'oceanbase',
+      oceanBaseProtocol: 'oracle',
+    })).toMatchObject({
+      type: 'oracle',
+      preferManualTotalCount: true,
+      supportsApproximateTableCount: true,
+    });
+  });
 });