feat: apply CloudHost palette and update footer attribution

Color palette (via custom.css override):
- Primary (main): seaweed #00b295 replaces fuchsia blue
- Borders/backgrounds: pale-sky #c9daea replaces light purple
- Highlights/secondary: neon-ice #03f7eb replaces electric indigo
- Text: coffee-bean #191516 replaces Woodsmoke
- Danger/error: cherry-rose #ab2346 replaces Mandy red

Footer copyright line replaced with:
"Based on free software by AFNIC and The Swedish Internet Foundation
🇪🇺 Hosted in the EU · Enhanced by Cloud Host (cloudhost.es)"

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

zonemaster-gui/src/themes/default/Footer.astro

@@ -39,7 +39,9 @@ import config from '@/config';
     </div>
     <Grid client:load cols={1}>
         <div class="zm-footer-copyright">
-            {m.copyright()}
+            Basado en software libre de <a href="https://www.afnic.fr/" target="_blank" rel="noopener">AFNIC</a> y <a href="https://internetstiftelsen.se/" target="_blank" rel="noopener">The Swedish Internet Foundation</a>
+            &nbsp;·&nbsp; 🇪🇺 Alojado en la UE
+            &nbsp;·&nbsp; Mejorado por <a href="https://cloudhost.es" target="_blank" rel="noopener">Cloud Host</a>
         </div>
     </Grid>
 </footer>

zonemaster-gui/src/themes/default/styles/custom.css

@@ -1 +1,55 @@
-/** Add your custom styles here */
+/* ============================================================
+   CloudHost / Zonemaster.es custom palette
+   Palette:
+     --pale-sky:    #c9daea  (light blue  – backgrounds, borders)
+     --neon-ice:    #03f7eb  (bright cyan – highlights, secondary)
+     --seaweed:     #00b295  (teal        – primary brand)
+     --coffee-bean: #191516  (near-black  – text, dark accents)
+     --cherry-rose: #ab2346  (dark rose   – danger, error, accents)
+   ============================================================ */
+
+:root {
+    /* ── Main (primary brand) — replaces Fuchsia Blue ──────── */
+    --color-palette-main-10:  #e4f3f0;   /* very light teal tint  */
+    --color-palette-main-30:  #c9daea;   /* pale-sky              */
+    --color-palette-main-50:  #00b295;   /* seaweed               */
+    --color-palette-main-70:  #008a74;   /* seaweed dark          */
+    --color-palette-main-90:  #004d41;   /* seaweed darkest       */
+
+    /* ── Secondary — replaces Electric Indigo ──────────────── */
+    --color-palette-secondary-10: #d0fefb;
+    --color-palette-secondary-30: #6ffaf4;
+    --color-palette-secondary-50: #03f7eb;   /* neon-ice            */
+    --color-palette-secondary-70: #02cfc5;   /* neon-ice dark       */
+    --color-palette-secondary-90: #016e6a;
+
+    /* ── Text / neutral — replaces Woodsmoke near-black ────── */
+    --color-palette-black-90: #191516;   /* coffee-bean           */
+
+    /* ── Danger — replaces Mandy red ───────────────────────── */
+    --color-palette-danger-10:  #f7dde4;
+    --color-palette-danger-30:  #d4708b;
+    --color-palette-danger-50:  #ab2346;   /* cherry-rose           */
+    --color-palette-danger-70:  #7e1833;
+    --color-palette-danger-90:  #3d0a18;
+
+    /* ── Error — same rose family ───────────────────────────── */
+    --color-palette-error-10:  #f7dde4;
+    --color-palette-error-30:  #d4708b;
+    --color-palette-error-50:  #ab2346;   /* cherry-rose           */
+    --color-palette-error-70:  #7e1833;
+    --color-palette-error-90:  #3d0a18;
+
+    /* ── Tab highlight ──────────────────────────────────────── */
+    --color-tab-highlight: #ab2346;       /* cherry-rose           */
+}
+
+/* Footer copyright bar: links readable on pale-sky background */
+.zm-footer-copyright a {
+    color: #004d41;
+    font-weight: 600;
+    text-decoration: underline;
+}
+.zm-footer-copyright a:hover {
+    color: #00b295;
+}