Fix notification_templates table column names

Update auth email template migration and edge function to use correct column names:
- template_key → key
- subject → email_subject
- html_content → email_body_html

Matches existing notification_templates schema used in NotifikasiTab.

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

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

supabase/functions/send-auth-otp/index.ts

@@ -82,7 +82,7 @@ serve(async (req: Request) => {
     const { data: template, error: templateError } = await supabase
       .from('notification_templates')
       .select('*')
-      .eq('template_key', 'auth_email_verification')
+      .eq('key', 'auth_email_verification')
       .single();
 
     if (templateError || !template) {
@@ -110,13 +110,13 @@ serve(async (req: Request) => {
     };
 
     // Process shortcodes in subject
-    let subject = template.subject;
+    let subject = template.email_subject;
     Object.entries(templateVars).forEach(([key, value]) => {
       subject = subject.replace(new RegExp(`{${key}}`, 'g'), value);
     });
 
     // Process shortcodes in HTML body
-    let htmlBody = template.html_content;
+    let htmlBody = template.email_body_html;
     Object.entries(templateVars).forEach(([key, value]) => {
       htmlBody = htmlBody.replace(new RegExp(`{${key}}`, 'g'), value);
     });