Báo cáo SEO: defensx.com

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Fix all SEO issues found in the audit of defensx.com.

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

```json
{
  "domain": "defensx.com",
  "scores": {
    "overall": 80,
    "performance": 0,
    "seo": 86,
    "accessibility": 61,
    "bestPractices": 85,
    "security": 83
  },
  "findings": [
    {
      "module": "headers",
      "severity": "high",
      "title": "Missing strict-transport-security",
      "description": "HSTS header is missing. The site may be vulnerable to downgrade attacks.",
      "recommendation": "Add Strict-Transport-Security header with max-age of at least 31536000"
    },
    {
      "module": "headers",
      "severity": "medium",
      "title": "Missing content-security-policy",
      "description": "CSP header is missing. The site may be vulnerable to XSS attacks.",
      "recommendation": "Add a Content-Security-Policy header to restrict resource loading"
    },
    {
      "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 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": "structured-data",
      "severity": "medium",
      "title": "Article missing datePublished",
      "description": "NewsArticle has no datePublished",
      "recommendation": "Add datePublished for article rich results"
    },
    {
      "module": "sitemap",
      "severity": "medium",
      "title": "Duplicate URLs in sitemap",
      "description": "31 duplicate URLs found in sitemap",
      "recommendation": "Remove duplicate URLs from the sitemap"
    },
    {
      "module": "content",
      "severity": "medium",
      "title": "Multiple H1 tags",
      "description": "Found 3 H1 tags (recommended: exactly 1)",
      "recommendation": "Use only one H1 per page; use H2-H6 for subsections"
    },
    {
      "module": "content",
      "severity": "high",
      "title": "Images missing alt text",
      "description": "2 image(s) have no alt attribute",
      "recommendation": "Add descriptive alt text to all images for accessibility and SEO"
    },
    {
      "module": "accessibility",
      "severity": "high",
      "title": "2 images missing alt attribute",
      "description": "Images without alt text are inaccessible to screen readers",
      "recommendation": "Add descriptive alt text to all informational images, or alt=\"\" for decorative ones"
    },
    {
      "module": "accessibility",
      "severity": "medium",
      "title": "Missing main landmark",
      "description": "No <main> element or role=\"main\" found",
      "recommendation": "Wrap primary content in a <main> element for screen reader navigation"
    },
    {
      "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": "medium",
      "title": "Generic link text",
      "description": "4 links use generic text like \"click here\" or \"read more\"",
      "recommendation": "Use descriptive link text that makes sense out of context"
    },
    {
      "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": "crawl-budget",
      "severity": "medium",
      "title": "High crawl delay",
      "description": "Crawl-delay is set to 10s — this significantly slows indexing",
      "recommendation": "Reduce or remove crawl-delay unless the server truly can't handle crawler traffic"
    },
    {
      "module": "page-experience",
      "severity": "high",
      "title": "Intrusive interstitials detected",
      "description": "Found 4 potential popup/overlay elements",
      "recommendation": "Reduce intrusive interstitials — they hurt mobile experience and can trigger Google penalties"
    }
  ]
}
```