fix(sidebar): 修复默认库过滤数据库树 (#175)

src/lib/databaseTree.ts

@@ -0,0 +1,13 @@
+import type { DatabaseInfo, TreeNode } from "@/types/database";
+
+export function buildDatabaseTreeNodes(connectionId: string, databases: DatabaseInfo[]): TreeNode[] {
+  return databases.map((db) => ({
+    id: `${connectionId}:${db.name}`,
+    label: db.name,
+    type: "database" as const,
+    connectionId,
+    database: db.name,
+    isExpanded: false,
+    children: [],
+  }));
+}