✨ feat(data-grid): 支持无主键表安全编辑

- 定位策略：新增主键、唯一索引和 Oracle ROWID 三类安全行定位能力
- 查询编辑器：简单单表 SELECT 自动补充隐藏定位列，复杂结果保持只读
- 表预览：无主键表可通过唯一索引或 Oracle ROWID 安全编辑
- 提交流程：移除无主键整行 WHERE fallback，隐藏定位列不参与展示和写入
- 后端保护：Oracle、MySQL、PostgreSQL 更新删除必须恰好影响 1 行
- 测试覆盖：补充 QueryEditor、DataViewer、DataGrid 和 ApplyChanges 相关用例
Refs #419

frontend/src/utils/queryResultTable.ts

@@ -0,0 +1,64 @@
+export type QueryResultTableRef = {
+  tableName: string;
+  metadataDbName: string;
+  metadataTableName: string;
+};
+
+const stripIdentifierQuotes = (part: string): string => {
+  const text = String(part || '').trim();
+  if (!text) return '';
+  if ((text.startsWith('`') && text.endsWith('`')) || (text.startsWith('"') && text.endsWith('"'))) {
+    return text.slice(1, -1).trim();
+  }
+  if (text.startsWith('[') && text.endsWith(']')) {
+    return text.slice(1, -1).trim();
+  }
+  return text;
+};
+
+const normalizeQualifiedName = (raw: string): string => (
+  String(raw || '')
+    .split('.')
+    .map((part) => stripIdentifierQuotes(part.trim()))
+    .filter(Boolean)
+    .join('.')
+);
+
+const isOracleLikeDialect = (dialect: string): boolean => {
+  const normalized = String(dialect || '').trim().toLowerCase();
+  return normalized === 'oracle' || normalized === 'dameng' || normalized === 'dm' || normalized === 'dm8';
+};
+
+export const extractQueryResultTableRef = (
+  sql: string,
+  dialect: string,
+  currentDb: string,
+): QueryResultTableRef | undefined => {
+  const text = String(sql || '').trim();
+  if (!text) return undefined;
+  if (/\b(JOIN|UNION|INTERSECT|EXCEPT|MINUS)\b/i.test(text)) return undefined;
+  if (/^\s*SELECT\s+DISTINCT\b/i.test(text)) return undefined;
+  if (/\bGROUP\s+BY\b|\bHAVING\b/i.test(text)) return undefined;
+
+  const tableMatch = text.match(/^\s*SELECT\s+.+?\s+FROM\s+((?:[`"\[]?\w+[`"\]]?)(?:\s*\.\s*(?:[`"\[]?\w+[`"\]]?)){0,2})\s*(?:$|[\s;])/im);
+  if (!tableMatch) return undefined;
+
+  const qualifiedName = normalizeQualifiedName(tableMatch[1]);
+  if (!qualifiedName) return undefined;
+
+  const parts = qualifiedName.split('.').filter(Boolean);
+  const metadataTableName = parts[parts.length - 1] || '';
+  if (!metadataTableName) return undefined;
+
+  const owner = parts.length >= 2 ? parts[parts.length - 2] : '';
+  const metadataDbName = owner || currentDb || '';
+  const tableName = isOracleLikeDialect(dialect) && owner
+    ? `${owner}.${metadataTableName}`
+    : metadataTableName;
+
+  return {
+    tableName,
+    metadataDbName,
+    metadataTableName,
+  };
+};