Informe SEO: cylex.es

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Fix all SEO issues found in the audit of cylex.es.

Prioritize high-severity issues first, then medium. For each fix, make the actual code change — don't just describe what to do.

```json
{
  "domain": "cylex.es",
  "scores": {
    "overall": 81,
    "performance": 0,
    "seo": 77,
    "accessibility": 77,
    "bestPractices": 83,
    "security": 85
  },
  "findings": [
    {
      "module": "dns",
      "severity": "medium",
      "title": "No DKIM record found",
      "description": "None of the common DKIM selectors returned a valid key. Email authentication may be incomplete.",
      "recommendation": "Configure DKIM signing with your email provider and publish the public key in DNS"
    },
    {
      "module": "headers",
      "severity": "medium",
      "title": "Missing x-frame-options",
      "description": "X-Frame-Options is missing. The site may be vulnerable to clickjacking.",
      "recommendation": "Add X-Frame-Options: DENY or SAMEORIGIN header"
    },
    {
      "module": "headers",
      "severity": "medium",
      "title": "CORS allows all origins",
      "description": "Access-Control-Allow-Origin: * allows any website to make requests",
      "recommendation": "Restrict CORS to specific trusted origins if the page handles sensitive data"
    },
    {
      "module": "meta",
      "severity": "medium",
      "title": "Missing canonical URL",
      "description": "No canonical link tag found",
      "recommendation": "Add a canonical URL to prevent duplicate content issues"
    },
    {
      "module": "meta",
      "severity": "medium",
      "title": "Missing og:title",
      "description": "Open Graph title is not set",
      "recommendation": "Add og:title meta tag for social sharing"
    },
    {
      "module": "meta",
      "severity": "medium",
      "title": "Missing og:image",
      "description": "No Open Graph image set. Social shares will lack a preview image.",
      "recommendation": "Add og:image meta tag (1200x630px recommended)"
    },
    {
      "module": "robots",
      "severity": "medium",
      "title": "No sitemap in robots.txt",
      "description": "robots.txt does not reference a sitemap",
      "recommendation": "Add Sitemap: https://yourdomain.com/sitemap.xml to robots.txt"
    },
    {
      "module": "sitemap",
      "severity": "high",
      "title": "Missing sitemap.xml",
      "description": "No sitemap.xml found at the root",
      "recommendation": "Create a sitemap.xml to help search engines discover all pages"
    },
    {
      "module": "accessibility",
      "severity": "medium",
      "title": "No skip navigation link",
      "description": "No skip-to-content link at the top of the page",
      "recommendation": "Add a visually hidden skip link as the first focusable element"
    },
    {
      "module": "accessibility",
      "severity": "high",
      "title": "1 buttons without accessible name",
      "description": "Buttons with no text, aria-label, or title are invisible to screen readers",
      "recommendation": "Add visible text or aria-label to all buttons"
    },
    {
      "module": "social-checker",
      "severity": "high",
      "title": "Missing og:title",
      "description": "Open Graph title is not set — social shares will use generic text",
      "recommendation": "Add og:title meta tag for compelling social media previews"
    },
    {
      "module": "social-checker",
      "severity": "medium",
      "title": "Missing og:description",
      "description": "Open Graph description is not set",
      "recommendation": "Add og:description for better social sharing previews"
    },
    {
      "module": "social-checker",
      "severity": "medium",
      "title": "Missing og:image",
      "description": "No social sharing image set — posts will lack visual appeal",
      "recommendation": "Add og:image meta tag (1200x630px recommended)"
    },
    {
      "module": "social-checker",
      "severity": "medium",
      "title": "Missing Twitter Card",
      "description": "No twitter:card meta tag — Twitter/X will use default preview",
      "recommendation": "Add twitter:card meta tag (e.g., \"summary_large_image\")"
    },
    {
      "module": "uptime-checker",
      "severity": "medium",
      "title": "Slow response time",
      "description": "Average response time is 2549ms (should be < 2000ms)",
      "recommendation": "Optimize server response time — consider CDN, caching, or server upgrades"
    },
    {
      "module": "brand-checker",
      "severity": "medium",
      "title": "No Organization schema",
      "description": "No Organization JSON-LD found",
      "recommendation": "Add Organization structured data with name, logo, and contact information"
    },
    {
      "module": "crawl-budget",
      "severity": "medium",
      "title": "No sitemap.xml found",
      "description": "sitemap.xml returned HTTP 404",
      "recommendation": "Create a sitemap.xml to help search engines discover all pages"
    },
    {
      "module": "indexing-checker",
      "severity": "medium",
      "title": "Missing canonical URL",
      "description": "No canonical link tag found — search engines may index duplicate versions",
      "recommendation": "Add a self-referencing canonical URL to prevent duplicate content issues"
    }
  ]
}
```