Add SMS bulk delay configuration and validate coupon phone function

database/migrations/2026_06_03_195148_create_sms_campaigns_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::create('sms_campaigns', function (Blueprint $table) {
+            $table->id();
+            $table->text('message');
+            $table->string('mode');
+            $table->unsignedInteger('recipient_count')->default(0);
+            $table->unsignedInteger('sent_count')->default(0);
+            $table->unsignedInteger('failed_count')->default(0);
+            $table->unsignedInteger('skipped_count')->default(0);
+            $table->string('laravel_batch_id')->nullable();
+            $table->foreignId('created_by')->constrained('users')->cascadeOnDelete();
+            $table->timestamp('completed_at')->nullable();
+            $table->timestamps();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('sms_campaigns');
+    }
+};

database/migrations/2026_06_03_195149_create_sms_send_logs_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::create('sms_send_logs', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('sms_campaign_id')->constrained()->cascadeOnDelete();
+            $table->foreignId('coupon_id')->nullable()->constrained()->nullOnDelete();
+            $table->string('phone');
+            $table->text('message');
+            $table->string('status');
+            $table->text('error_message')->nullable();
+            $table->timestamp('attempted_at')->nullable();
+            $table->timestamps();
+
+            $table->index(['sms_campaign_id', 'status']);
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('sms_send_logs');
+    }
+};