feat: add locale prefixes to all email template URLs

Updated all email templates to include locale prefixes (/en/ or /hr/)
in URLs to ensure language consistency when users click email links.

Changes:
- Email validation templates: /email/verify/ → /{locale}/email/verify/
- Rent due templates: /share/rent-due/ → /{locale}/share/rent-due/
- Bills due templates: /share/bills-due/ → /{locale}/share/bills-due/
- Unsubscribe links: /email/unsubscribe/ → /{locale}/email/unsubscribe/
- Base site links in EN templates: / → /en

Benefits:
- Users land on pages in the same language as their email
- Better UX - no manual language switching needed
- Proper i18n implementation

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

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

email-worker/email-templates/email-template--email-validation--en.html

@@ -78,7 +78,7 @@
                                         <table role="presentation" cellspacing="0" cellpadding="0" border="0" width="100%">
                                             <tr>
                                                 <td style="text-align: center; padding: 0 0 30px 0;">
-                                                    <a href="https://rezije.app/email/verify/${shareId}"
+                                                    <a href="https://rezije.app/en/email/verify/${shareId}"
                                                        style="display: inline-block; padding: 14px 40px; background-color: #5b5ba6  ; color: #ffffff; text-decoration: none; font-size: 16px; font-weight: bold; border-radius: 6px; border: none;">
                                                         I accept
                                                     </a>
@@ -90,7 +90,7 @@
                                             Or copy and paste this link into your browser:
                                         </p>
                                         <p style="margin: 0 0 20px 0; font-size: 13px; line-height: 20px; color: #0070F3; text-align: center; word-break: break-all;">
-                                            https://rezije.app/email/verify/${shareId}
+                                            https://rezije.app/en/email/verify/${shareId}
                                         </p>
 
                                         <!-- Divider -->