chore: update email FROM address and fix unsubscribe link (refs #221)

Change default FROM to [email protected] across app and CI
senders. Replace broken {{unsubscribeUrl}} placeholder with real Settings
page URL. Add RFC 8058 List-Unsubscribe headers for email client support.

Co-Authored-By: Claude Opus 4.6 <[email protected]>

backend/src/features/notifications/README.md

@@ -97,7 +97,7 @@ Templates use `{{variableName}}` syntax for variable substitution.
 
 ### Environment Variables
 - `RESEND_API_KEY` - Resend API key (required, stored in secrets)
-- `FROM_EMAIL` - Sender email address (default: noreply@motovaultpro.com)
+- `FROM_EMAIL` - Sender email address (default: hello@notify.motovaultpro.com)
 
 ### Email Delivery
 - Uses Resend API for transactional emails

backend/src/features/notifications/domain/email-layout/base-layout.ts

@@ -65,7 +65,7 @@ export function renderEmailLayout(content: string): string {
                       <a href="https://motovaultpro.com" style="${EMAIL_STYLES.footerLink}" target="_blank">Login to MotoVaultPro</a>
                     </p>
                     <p style="${EMAIL_STYLES.footerText}">
-                      <a href="{{unsubscribeUrl}}" style="${EMAIL_STYLES.footerLink}" target="_blank">Manage Email Preferences</a>
+                      <a href="https://motovaultpro.com/settings" style="${EMAIL_STYLES.footerLink}" target="_blank">Manage Email Preferences</a>
                     </p>
                     <p style="${EMAIL_STYLES.copyright}">
                       &copy; {new Date().getFullYear()} MotoVaultPro. All rights reserved.

backend/src/features/notifications/domain/email.service.ts

@@ -16,7 +16,7 @@ export class EmailService {
     }
 
     this.resend = new Resend(apiKey);
-    this.fromEmail = process.env['FROM_EMAIL'] || 'inf[email protected]';
+    this.fromEmail = process.env['FROM_EMAIL'] || 'hell[email protected]';
   }
 
   /**
@@ -33,6 +33,10 @@ export class EmailService {
         to,
         subject,
         html,
+        headers: {
+          'List-Unsubscribe': '<https://motovaultpro.com/settings>',
+          'List-Unsubscribe-Post': 'List-Unsubscribe=One-Click',
+        },
       });
     } catch (error) {
       const errorMessage = error instanceof Error ? error.message : 'Unknown error';