feat: caching, optimization, legal pages & footer

- WP Super Cache enabled (PHP mode, gzip, Nginx compatible)
- Autoptimize: CSS/HTML minification + deferred JS + Google Fonts optimization
- Cookie Notice: GDPR/LOPD banner styled with brand colors (navy/burgundy/gold)
- Legal pages: Aviso Legal, Política de Privacidad, Política de Cookies (ES)
- MU-plugin: custom footer with legal links + Cloud Host credit
- Footer: copyright, legal nav, Hosted & Maintained by Cloud Host (cloudhost.es)
- Security: X-Frame-Options, X-Content-Type, Referrer-Policy headers
- Security: XML-RPC disabled, REST user enumeration blocked
- Performance: emoji scripts removed, post revisions limited to 3

wp-content/plugins/cookie-notice/css/admin-notice.css

@@ -0,0 +1,43 @@
+#cn-admin-notice.cn-notice {
+    border-left-color: #20c19e;
+}
+.cn-notice .cn-notice-container {
+    padding: 1em;
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+}
+.cn-notice .cn-notice-actions {
+    margin-bottom: 0;
+}
+.cn-notice .cn-notice-actions .button {
+    display: inline-block;
+    margin: 0.5em 0 0;
+}
+.cn-notice .cn-notice-text h2 {
+    margin-top: 0;
+    margin-bottom: 0.5em;
+}
+.cn-notice .cn-notice-dismiss, .cn-notice .cn-notice-delay {
+    margin-left: 1em;
+}
+.cn-notice .cn-notice-text strong {
+    color: #000;
+}
+.cn-notice .cn-notice-text p:last-child {
+    margin-bottom: 0;
+}
+.cn-notice .cn-notice-icon svg path {
+    fill: #666 !important;
+}
+@media only screen and (max-width: 960px) {
+    .cn-notice .cn-notice-container {
+        flex-direction: column;
+        align-items: initial;
+    }
+
+    .cn-notice .cn-notice-container .cn-notice-text {
+        order: 1;
+        padding-top: 1em;
+    }
+}