Fix email system and implement OTP confirmation flow

Email System Fixes:
- Fix email sending after payment: handle-order-paid now calls send-notification
  instead of send-email-v2 directly, properly processing template variables
- Fix order_created email timing: sent immediately after order creation,
  before payment QR code generation
- Update email templates to use short order ID (8 chars) instead of full UUID
- Add working "Akses Sekarang" buttons to payment_success and access_granted emails
- Add platform_url column to platform_settings for email links

OTP Verification Flow:
- Create dedicated /confirm-otp page for users who close registration modal
- Add link in checkout modal and email to dedicated OTP page
- Update OTP email template with better copywriting and dedicated page link
- Fix send-auth-otp to fetch platform settings for dynamic brand_name and platform_url
- Auto-login users after OTP verification in checkout flow

Admin Features:
- Add delete user functionality with cascade deletion of all related data
- Update IntegrasiTab to read/write email settings from platform_settings only
- Add test email template for email configuration testing

Cleanup:
- Remove obsolete send-consultation-reminder and send-test-email functions
- Update send-email-v2 to read email config from platform_settings
- Remove footer links (Ubah Preferensi/Unsubscribe) from email templates

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

supabase/migrations/20250103000001_update_auth_otp_email_copywriting.sql

@@ -0,0 +1,54 @@
+-- ============================================================================
+-- Update Auth OTP Email Template - Better Copywriting with Dedicated Page Link
+-- ============================================================================
+
+-- Update auth_email_verification template with improved copywriting
+UPDATE notification_templates
+SET
+  email_subject = 'Konfirmasi Email Anda - {platform_name}',
+  email_body_html = '---
+<h1>🔐 Konfirmasi Alamat Email</h1>
+
+<p>Selamat datang di <strong>{platform_name}</strong>!</p>
+
+<p>Terima kasih telah mendaftar. Untuk mengaktifkan akun Anda, masukkan kode verifikasi 6 digit berikut:</p>
+
+<div class="otp-box">{otp_code}</div>
+
+<p><strong>⏰ Berlaku selama {expiry_minutes} menit</strong></p>
+
+<h2>🎯 Cara Verifikasi:</h2>
+<ol>
+  <li><strong>Kembali ke halaman pendaftaran</strong> - Form OTP sudah otomatis muncul</li>
+  <li><strong>Masukkan kode 6 digit</strong> di atas pada kolom verifikasi</li>
+  <li><strong>Klik "Verifikasi Email"</strong> dan akun Anda siap digunakan!</li>
+</ol>
+
+<h2>🔄 Halaman Khusus Verifikasi</h2>
+<p>Jika Anda kehilangan halaman pendaftaran atau tertutup tidak sengaja, jangan khawatir! Anda tetap bisa memverifikasi akun melalui:</p>
+
+<p class="text-center" style="margin: 20px 0;">
+  <a href="{platform_url}/confirm-otp?user_id={user_id}&email={email}" class="button" style="display: inline-block; padding: 12px 24px; background-color: #000; color: #fff; text-decoration: none; border-radius: 4px; font-weight: bold;">
+    📧 Buka Halaman Verifikasi Khusus
+  </a>
+</p>
+
+<p style="font-size: 14px; color: #666;">
+  <em>Link ini akan membawa Anda ke halaman khusus untuk memasukkan kode verifikasi.</em>
+</p>
+
+<div class="alert-warning" style="margin: 20px 0; padding: 15px; background-color: #fff3cd; border-left: 4px solid #ffc107;">
+  <p style="margin: 0;"><strong>💡 Tips:</strong> Cek folder <em>Spam</em> atau <em>Promotions</em> jika email tidak muncul di inbox dalam 1-2 menit.</p>
+</div>
+
+<blockquote class="alert-info">
+  <strong>ℹ️ Info:</strong> Jika Anda tidak merasa mendaftar di {platform_name}, abaikan email ini dengan aman.
+</blockquote>
+---'
+WHERE key = 'auth_email_verification';
+
+-- Return success message
+DO $$
+BEGIN
+  RAISE NOTICE 'Auth email template updated with improved copywriting and dedicated page link';
+END $$;