add auth

cmd/migrate/migrations/000002_create_users_table.down.sql

@@ -0,0 +1 @@
+DROP TABLE IF EXISTS users;

cmd/migrate/migrations/000002_create_users_table.up.sql

@@ -0,0 +1,10 @@
+CREATE TABLE IF NOT EXISTS users (
+    id UUID PRIMARY KEY,
+    email VARCHAR(255) UNIQUE NOT NULL,
+    username VARCHAR(255) NOT NULL,
+    password VARCHAR(255) NOT NULL,
+    created_at TIMESTAMP NOT NULL,
+    updated_at TIMESTAMP NOT NULL
+);
+
+CREATE INDEX IF NOT EXISTS idx_users_email ON users(email);