Update user registration email format, remove unused SMS helper function, and adjust database migration for user meta column

app/Modules/OTPVerification/Database/Migrations/2025_09_22_164249_create_o_t_p_verifications_table.php

@@ -0,0 +1,29 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('otp_verifications', function (Blueprint $table) {
+            $table->id();
+            $table->string('username');
+            $table->string('code');
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('otp_verifications');
+    }
+};