🐛 fix(mongodb): 支持 Mongo shell 快捷查询命令

- 为 show dbs 和 show databases 转换 listDatabases JSON 命令
- 为 show collections 和 show tables 转换 listCollections JSON 命令
- 补充 Mongo shell 快捷命令回归测试并验证前端构建

Fixes #390

frontend/src/utils/mongodb.test.ts

@@ -0,0 +1,19 @@
+import { describe, expect, it } from 'vitest';
+
+import { convertMongoShellToJsonCommand } from './mongodb';
+
+describe('convertMongoShellToJsonCommand', () => {
+  it('converts show dbs shell shortcut to listDatabases command', () => {
+    expect(convertMongoShellToJsonCommand('show dbs;')).toEqual({
+      recognized: true,
+      command: JSON.stringify({ listDatabases: 1, nameOnly: true }),
+    });
+  });
+
+  it('converts show collections shell shortcut to listCollections command', () => {
+    expect(convertMongoShellToJsonCommand(' show collections ')).toEqual({
+      recognized: true,
+      command: JSON.stringify({ listCollections: 1, filter: {}, nameOnly: true }),
+    });
+  });
+});