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/wp-super-cache/rest/class.wp-super-cache-rest-update-plugins.php

@@ -0,0 +1,22 @@
+<?php
+
+class WP_Super_Cache_Rest_Update_Plugins extends WP_REST_Controller {
+
+	/**
+	 * Toggle plugins on/off through the /plugins/ endpoint
+	 *
+	 * @param WP_REST_Request $request Full data about the request.
+	 * @return WP_Error|WP_REST_Response
+	 */
+	public function callback( $request ) {
+		$parameters = $request->get_json_params();
+
+		global $valid_nonce;
+		$valid_nonce = true;
+
+		wpsc_update_plugin_list( $parameters );
+		$list = wpsc_get_plugin_list();
+
+		return rest_ensure_response( $list );
+	}
+}