fix: add compass logo PNG for emails (SVG converted to 128x128 PNG)

Previous logo-circle.png was 404, favicon-192 was wrong icon.
Generated logo-email.png from favicon.svg compass via sharp.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

blueprints/admin/routes_users_api.py

@@ -520,7 +520,7 @@ def _build_role_notification_html(user_name, company_name, company_slug, company
 
 <!-- Header -->
 <tr><td style="background: linear-gradient(135deg, #1e40af, #172554); padding: 36px 32px; text-align: center;">
-    <img src="https://nordabiznes.pl/static/img/favicon-192.png" width="64" height="64" alt="NB" style="border-radius:50%; margin-bottom:16px; border: 2px solid rgba(255,255,255,0.3);">
+    <img src="https://nordabiznes.pl/static/img/logo-email.png" width="64" height="64" alt="NB" style="border-radius:50%; margin-bottom:16px; border: 2px solid rgba(255,255,255,0.3);">
     <h1 style="margin:0; color:#ffffff; font-size:24px; font-weight:700;">Zmiana uprawnień</h1>
     <p style="margin:8px 0 0; color:#93c5fd; font-size:14px;">Norda Biznes Partner</p>
 </td></tr>

email_service.py

@@ -353,7 +353,7 @@ def _email_v3_wrap(title: str, subtitle: str, content_html: str) -> str:
 <table width="600" cellpadding="0" cellspacing="0" style="background:#ffffff; border-radius:12px; overflow:hidden; box-shadow: 0 4px 24px rgba(0,0,0,0.08);">
 
 <tr><td style="background: linear-gradient(135deg, #1e40af, #172554); padding: 36px 32px; text-align: center;">
-    <img src="https://nordabiznes.pl/static/img/favicon-192.png" width="64" height="64" alt="NB" style="border-radius:50%; margin-bottom:16px; border: 2px solid rgba(255,255,255,0.3);">
+    <img src="https://nordabiznes.pl/static/img/logo-email.png" width="64" height="64" alt="NB" style="border-radius:50%; margin-bottom:16px; border: 2px solid rgba(255,255,255,0.3);">
     <h1 style="margin:0; color:#ffffff; font-size:24px; font-weight:700;">{title}</h1>
     <p style="margin:8px 0 0; color:#93c5fd; font-size:14px;">{subtitle}</p>
 </td></tr>