✨ feat(data-sync/oceanbase): 拆分比对入口并修复 OceanBase Oracle 连接

- 数据同步：新增表结构比对、数据比对两个独立工具入口
- 比对模式：为 DataSyncModal 增加只读入口展示与模式化文案
- OceanBase：Oracle 租户改用 OB Oracle 专用 MySQL-wire 连接路径
- 连接表单：允许 OceanBase Oracle Service Name 留空，仅 TNS 场景需要填写
- 驱动提示：revision 不匹配提示收敛到驱动管理，不再在普通数据源入口弹出
- 测试覆盖：补充数据比对入口、OceanBase Oracle、driver-agent 提示边界测试

frontend/src/components/DataSyncModal.entry-mode.test.ts

@@ -0,0 +1,32 @@
+import { describe, expect, it } from 'vitest';
+
+import { resolveDataSyncEntryModePresentation } from './dataSyncEntryMode';
+
+describe('resolveDataSyncEntryModePresentation', () => {
+  it('marks schema compare as a read-only independent entry', () => {
+    const presentation = resolveDataSyncEntryModePresentation('schemaCompare');
+
+    expect(presentation.title).toBe('表结构比对');
+    expect(presentation.analyzeButtonText).toBe('开始比对');
+    expect(presentation.badgeText).toBe('结构比对');
+    expect(presentation.readOnly).toBe(true);
+  });
+
+  it('marks data compare as a read-only independent entry', () => {
+    const presentation = resolveDataSyncEntryModePresentation('dataCompare');
+
+    expect(presentation.title).toBe('数据比对');
+    expect(presentation.tableSelectLabel).toContain('比对数据');
+    expect(presentation.badgeText).toBe('数据比对');
+    expect(presentation.readOnly).toBe(true);
+  });
+
+  it('keeps the original sync entry writable', () => {
+    const presentation = resolveDataSyncEntryModePresentation('sync');
+
+    expect(presentation.title).toBe('数据同步工作台');
+    expect(presentation.analyzeButtonText).toBe('对比差异');
+    expect(presentation.badgeText).toBe('同步模式');
+    expect(presentation.readOnly).toBe(false);
+  });
+});