🐛 fix(query-editor): 修复 SQL 美化未按数据库方言选择格式化器

- 为 QueryEditor 美化入口按当前连接类型动态选择 sql-formatter language
- 让 postgres、kingbase、highgo、vastbase、opengauss、gaussdb 使用 postgresql 方言
- 让 oracle、dameng 使用 plsql，避免固定 mysql 方言导致语法解析失败
- 补充 PostgreSQL 窗口函数与类型转换 SQL 的美化回归测试

Close #561

frontend/src/components/QueryEditor.tsx

@@ -1,7 +1,7 @@
 import React, { useState, useEffect, useRef, useMemo, useCallback } from 'react';
 import Editor, { type OnMount } from './MonacoEditor';
 import { message, Modal, Input, Form, MenuProps } from 'antd';
-import { format } from 'sql-formatter';
+import { format, type SqlLanguage } from 'sql-formatter';
 import { v4 as uuidv4 } from 'uuid';
 import { TabData, ColumnDefinition, IndexDefinition } from '../types';
 import { useStore } from '../store';
@@ -468,6 +468,38 @@ const normalizeMetadataDialect = (conn: any): string => {
     return String(dialect || '').toLowerCase();
 };
 
+const resolveQueryEditorFormatterLanguage = (conn: any): SqlLanguage => {
+    const dialect = normalizeMetadataDialect(conn);
+    switch (dialect) {
+        case 'postgres':
+        case 'kingbase':
+        case 'highgo':
+        case 'vastbase':
+        case 'opengauss':
+        case 'gaussdb':
+            return 'postgresql';
+        case 'duckdb':
+            return 'duckdb';
+        case 'sqlite':
+            return 'sqlite';
+        case 'sqlserver':
+            return 'transactsql';
+        case 'oracle':
+        case 'dameng':
+            return 'plsql';
+        case 'clickhouse':
+            return 'clickhouse';
+        case 'mysql':
+        case 'goldendb':
+        case 'sphinx':
+            return 'mysql';
+        case 'mariadb':
+            return 'mariadb';
+        default:
+            return 'sql';
+    }
+};
+
 const buildCompletionTableCommentSQL = (dialect: string, dbName: string): string => {
     const db = String(dbName || '').trim();
     const escapedDb = escapeMetadataSqlLiteral(db);
@@ -3684,7 +3716,8 @@ const QueryEditor: React.FC<{ tab: TabData; isActive?: boolean }> = ({ tab, isAc
 
   const handleFormat = () => {
       try {
-          const formatted = format(getCurrentQuery(), { language: 'mysql', keywordCase: sqlFormatOptions.keywordCase });
+          const formatterLanguage = resolveQueryEditorFormatterLanguage(connections.find(c => c.id === currentConnectionId));
+          const formatted = format(getCurrentQuery(), { language: formatterLanguage, keywordCase: sqlFormatOptions.keywordCase });
           const editor = editorRef.current;
           const monaco = monacoRef.current;
           const model = editor?.getModel?.();