feat: 配置数据库连接

src/db/index.ts

@@ -0,0 +1,8 @@
+import { drizzle } from 'drizzle-orm/libsql';
+import { createClient } from '@libsql/client';
+
+const client = createClient({
+  url: process.env.DATABASE_URL || 'file:./data.db',
+});
+
+export const db = drizzle(client);