feat(contact): add local jsonl backup for fail-safe lead retention

app/actions/contact.ts

@@ -45,6 +45,28 @@ export async function sendContactFormAction(formData: FormData) {
     email,
   });
 
+  // 1.5. Simple Fail-Safe Backup to Disk
+  // To ensure leads are never lost if email fails or Gotify is down, we append them to a local JSON Lines file.
+  try {
+    const fs = await import('fs');
+    const path = await import('path');
+    const backupDir = path.join(process.cwd(), '.data');
+    if (!fs.existsSync(backupDir)) fs.mkdirSync(backupDir, { recursive: true });
+
+    const backupFile = path.join(backupDir, 'leads-backup.jsonl');
+    const leadData = {
+      timestamp: new Date().toISOString(),
+      name,
+      email,
+      productName,
+      message,
+    };
+    fs.appendFileSync(backupFile, JSON.stringify(leadData) + '\\n');
+    logger.info('Successfully saved lead to local backup file', { backupFile });
+  } catch (backupError) {
+    logger.error('Failed to write to local leads backup', { error: String(backupError) });
+  }
+
   // 2. Send Emails
   logger.info('Sending branded emails', { email, productName });