feat(email-blast): tambahkan model dan migrasi untuk riwayat email blast

- Menambahkan model EmailBlastHistory untuk menyimpan informasi riwayat email blast.
- Membuat migrasi untuk tabel email_blast_histories dengan kolom subject, content, recipients_count, dan status.

database/migrations/2025_02_15_125412_create_email_blast_histories_table.php

@@ -0,0 +1,25 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class CreateEmailBlastHistoriesTable extends Migration
+{
+    public function up()
+    {
+        Schema::create('email_blast_histories', function (Blueprint $table) {
+            $table->id();
+            $table->string('subject');
+            $table->text('content');
+            $table->integer('recipients_count');
+            $table->string('status');
+            $table->timestamps();
+        });
+    }
+
+    public function down()
+    {
+        Schema::dropIfExists('email_blast_histories');
+    }
+}