refacto: use @db/sqlite for better usage

src/migrations/init.ts

@@ -1,6 +1,6 @@
 import { db } from "../data/db.ts";
 
-db.execute(`
+db.exec(`
   CREATE TABLE IF NOT EXISTS note (
     title TEXT NOT NULL,
     publishedAt DATETIME,
@@ -11,7 +11,7 @@ db.execute(`
   );
 `);
 
-db.execute(`
+db.exec(`
   CREATE TABLE IF NOT EXISTS state (
     key TEXT PRIMARY KEY,
     value TEXT NOT NULL