🐛 fix(duckdb): 修复唯一索引识别与多库对象解析

- 合并 DuckDB 约束与索引元数据，恢复唯一索引表的可编辑判定
- 修复 attach 多库场景下 catalog/schema/table 定位混乱问题
- 统一前后端 qualified name 解析，支持带点和带引号对象名
- 补充 DuckDB 元数据与编辑链路回归测试

frontend/src/components/TriggerViewer.tsx

@@ -6,6 +6,7 @@ import { useStore } from '../store';
 import { DBQuery } from '../../wailsjs/go/app/App';
 import { buildRpcConnectionConfig } from '../utils/connectionRpcConfig';
 import { normalizeOceanBaseProtocol } from '../utils/oceanBaseProtocol';
+import { splitQualifiedNameLast } from '../utils/qualifiedName';
 
 interface TriggerViewerProps {
     tab: TabData;
@@ -25,12 +26,8 @@ const TriggerViewer: React.FC<TriggerViewerProps> = ({ tab }) => {
     const escapeSQLLiteral = (raw: string): string => String(raw || '').replace(/'/g, "''");
     const quoteSqlServerIdentifier = (raw: string): string => `[${String(raw || '').replace(/]/g, ']]')}]`;
     const parseSchemaAndName = (fullName: string): { schema: string; name: string } => {
-        const raw = String(fullName || '').trim();
-        const idx = raw.lastIndexOf('.');
-        if (idx > 0 && idx < raw.length - 1) {
-            return { schema: raw.substring(0, idx), name: raw.substring(idx + 1) };
-        }
-        return { schema: '', name: raw };
+        const parsed = splitQualifiedNameLast(fullName);
+        return { schema: parsed.parentPath, name: parsed.objectName };
     };
 
     const getMetadataDialect = (conn: any): string => {