chore: rebrand navbar + footer — tadpole logo, retrait Boutique nav, copyright Tetardtek

- Logo bretzel → tadpole.svg (navbar + footer)
- Retrait lien Boutique de la navigation (page conservée, masquée)
- Footer : texte Clickerz, GitHub Kevin T seul, © 2026 Tetardtek · Powered by Brain

Frontend/src/scss/components/footer.scss

@@ -22,7 +22,7 @@
   }
 
   .footer-logo {
-    background-image: url(/svg/logo.svg);
+    background-image: url(/svg/tadpole.svg);
     background-size: contain;
     background-position: center;
     background-repeat: no-repeat;