Báo cáo SEO: studyinkorea.go.kr

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Fix all SEO issues found in the audit of studyinkorea.go.kr.

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

```json
{
  "domain": "studyinkorea.go.kr",
  "scores": {
    "overall": 73,
    "performance": 0,
    "seo": 77,
    "accessibility": 62,
    "bestPractices": 84,
    "security": 72
  },
  "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": "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-content-type-options",
      "description": "X-Content-Type-Options is missing. MIME-sniffing attacks are possible.",
      "recommendation": "Add X-Content-Type-Options: nosniff header"
    },
    {
      "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": "meta",
      "severity": "medium",
      "title": "Missing canonical URL",
      "description": "No canonical link tag found",
      "recommendation": "Add a canonical URL to prevent duplicate content issues"
    },
    {
      "module": "structured-data",
      "severity": "medium",
      "title": "No structured data found",
      "description": "No JSON-LD schemas detected on the page",
      "recommendation": "Add structured data (Organization, WebSite, BreadcrumbList) for rich search results"
    },
    {
      "module": "sitemap",
      "severity": "medium",
      "title": "Duplicate URLs in sitemap",
      "description": "1 duplicate URLs found in sitemap",
      "recommendation": "Remove duplicate URLs from the sitemap"
    },
    {
      "module": "technology",
      "severity": "medium",
      "title": "Render-blocking scripts",
      "description": "18 scripts load synchronously without async/defer",
      "recommendation": "Add async or defer to non-critical scripts to improve page load speed"
    },
    {
      "module": "technology",
      "severity": "medium",
      "title": "Mixed content detected",
      "description": "12 resources loaded over HTTP on an HTTPS page",
      "recommendation": "Update all resource URLs to use HTTPS"
    },
    {
      "module": "content",
      "severity": "medium",
      "title": "External links without noopener",
      "description": "31 external links with target=\"_blank\" lack rel=\"noopener\"",
      "recommendation": "Add rel=\"noopener noreferrer\" to all target=\"_blank\" links"
    },
    {
      "module": "content",
      "severity": "medium",
      "title": "Low keyword relevance",
      "description": "Only 22% of title keywords appear in body text",
      "recommendation": "Ensure the page content includes the keywords from the title"
    },
    {
      "module": "mobile",
      "severity": "medium",
      "title": "Fixed-width elements may cause horizontal scroll",
      "description": "2 elements have fixed widths > 400px",
      "recommendation": "Use max-width: 100% or responsive units instead of fixed pixel widths"
    },
    {
      "module": "accessibility",
      "severity": "high",
      "title": "4 form fields without labels",
      "description": "Form inputs without associated labels are inaccessible",
      "recommendation": "Use <label for=\"id\"> or aria-label on every form field"
    },
    {
      "module": "accessibility",
      "severity": "medium",
      "title": "Positive tabindex values found",
      "description": "1 elements use tabindex > 0, which disrupts natural tab order",
      "recommendation": "Use tabindex=\"0\" or tabindex=\"-1\" instead of positive values"
    },
    {
      "module": "accessibility",
      "severity": "high",
      "title": "3 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": "rate-limits",
      "severity": "medium",
      "title": "No rate limiting detected",
      "description": "10 rapid requests all succeeded without any rate-limit headers or 429 responses. The site may be vulnerable to abuse.",
      "recommendation": "Implement rate limiting (e.g., 429 Too Many Requests) to protect against brute-force attacks"
    },
    {
      "module": "social-checker",
      "severity": "medium",
      "title": "og:image not accessible",
      "description": "OG image returned HTTP 404",
      "recommendation": "Ensure og:image URL is publicly accessible"
    },
    {
      "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": "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": "page-experience",
      "severity": "high",
      "title": "Intrusive interstitials detected",
      "description": "Found 9 potential popup/overlay elements",
      "recommendation": "Reduce intrusive interstitials — they hurt mobile experience and can trigger Google penalties"
    },
    {
      "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"
    }
  ]
}
```