🐛 fix(frontend): 修复 DuckDB 对象编辑与安全修改回归

- 修复 DuckDB qualified table 在查询结果页丢失 schema 导致无法识别主键的问题

- 打开对象修改前强制刷新最新定义，并避免切换对象失败时沿用旧定义

- 为 DuckDB 元数据链路补充前后端回归测试，并给 app 层真实 runtime 测试增加环境门槛

frontend/src/utils/queryResultTable.test.ts

@@ -48,6 +48,15 @@ describe('extractQueryResultTableRef', () => {
       });
   });
 
+  it('keeps DuckDB schema-qualified table names for metadata lookups', () => {
+    expect(extractQueryResultTableRef('SELECT * FROM main.events LIMIT 500', 'duckdb', 'main'))
+      .toEqual({
+        tableName: 'main.events',
+        metadataDbName: 'main',
+        metadataTableName: 'main.events',
+      });
+  });
+
   it('does not mark join results as editable table refs', () => {
     expect(extractQueryResultTableRef('SELECT * FROM users u JOIN orders o ON u.id = o.user_id', 'oracle', 'APP'))
       .toBeUndefined();

frontend/src/utils/queryResultTable.ts

@@ -21,6 +21,11 @@ const isOracleLikeDialect = (dialect: string): boolean => {
   return normalized === 'oracle' || normalized === 'dameng' || normalized === 'dm' || normalized === 'dm8';
 };
 
+const keepsQualifiedTableNameForMetadata = (dialect: string): boolean => {
+  const normalized = String(dialect || '').trim().toLowerCase();
+  return normalized === 'duckdb';
+};
+
 const isQuotedIdentifier = (part: string): boolean => {
   const text = String(part || '').trim();
   if (!text) return false;
@@ -73,13 +78,16 @@ export const extractQueryResultTableRef = (
 
   const owner = parts.length >= 2 ? parts[parts.length - 2] : '';
   const metadataDbName = owner || normalizeCurrentDbName(currentDb, dialect);
-  const tableName = isOracleLikeDialect(dialect) && owner
+  const tableName = (isOracleLikeDialect(dialect) || keepsQualifiedTableNameForMetadata(dialect)) && owner
+    ? `${owner}.${metadataTableName}`
+    : metadataTableName;
+  const resolvedMetadataTableName = keepsQualifiedTableNameForMetadata(dialect) && owner
     ? `${owner}.${metadataTableName}`
     : metadataTableName;
 
   return {
     tableName,
     metadataDbName,
-    metadataTableName,
+    metadataTableName: resolvedMetadataTableName,
   };
 };