feat: email template management with DB override, modern mail redesign

database/migrations/2026_04_20_000001_create_mail_templates_table.php

@@ -0,0 +1,23 @@
+<?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('v2_mail_templates', function (Blueprint $table) {
+            $table->id();
+            $table->string('name', 64)->unique();
+            $table->string('subject', 255);
+            $table->longText('content');
+            $table->timestamps();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('v2_mail_templates');
+    }
+};