Refactor user and session migrations to use UUIDs; update DatabaseSeeder for test user creation; enhance LetterController with search functionality and API route protection

database/seeders/DatabaseSeeder.php

@@ -13,11 +13,10 @@ class DatabaseSeeder extends Seeder
      */
     public function run(): void
     {
-        // User::factory(10)->create();
-
         User::factory()->create([
             'name' => 'Test User',
             'email' => 'test@example.com',
+            'password' => bcrypt('password')
         ]);
     }
 }