🐛 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 }),
+    });
+  });
+});

frontend/src/utils/mongodb.ts

@@ -752,10 +752,42 @@ const buildMongoDeleteCommand = (
   return JSON.stringify(command);
 };
 
+const convertMongoShellShortcutCommand = (raw: string): ShellConvertResult | null => {
+  const normalized = String(raw || '')
+    .replace(/[;；]+\s*$/, '')
+    .trim()
+    .replace(/\s+/g, ' ')
+    .toLowerCase();
+
+  if (!normalized) {
+    return null;
+  }
+
+  if (normalized === 'show dbs' || normalized === 'show databases') {
+    return {
+      recognized: true,
+      command: JSON.stringify({ listDatabases: 1, nameOnly: true }),
+    };
+  }
+
+  if (normalized === 'show collections' || normalized === 'show tables') {
+    return {
+      recognized: true,
+      command: JSON.stringify({ listCollections: 1, filter: {}, nameOnly: true }),
+    };
+  }
+
+  return null;
+};
+
 export const convertMongoShellToJsonCommand = (raw: string): ShellConvertResult => {
   let input = String(raw || '').trim();
   input = input.replace(/^[\s]*(\/\/[^\n]*\n)+/g, '').trim();
   input = input.replace(/[;；]+\s*$/, '');
+  const shortcut = convertMongoShellShortcutCommand(input);
+  if (shortcut) {
+    return shortcut;
+  }
   if (!/^db\./i.test(input)) {
     return { recognized: false };
   }