feat(seo-audit): Add comprehensive SEO audit skill

Add ourdigital-seo-audit skill with:
- Full site audit orchestrator (full_audit.py)
- Google Search Console and PageSpeed API clients
- Schema.org JSON-LD validation and generation
- XML sitemap and robots.txt validation
- Notion database integration for findings export
- Core Web Vitals measurement and analysis
- 7 schema templates (article, faq, product, etc.)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

ourdigital-custom-skills/12-ourdigital-seo-audit/templates/schema_templates/website.json

@@ -0,0 +1,25 @@
+{
+  "@context": "https://schema.org",
+  "@type": "WebSite",
+  "name": "{{site_name}}",
+  "alternateName": "{{alternate_name}}",
+  "url": "{{url}}",
+  "description": "{{description}}",
+  "inLanguage": "{{language}}",
+  "potentialAction": {
+    "@type": "SearchAction",
+    "target": {
+      "@type": "EntryPoint",
+      "urlTemplate": "{{search_url_template}}"
+    },
+    "query-input": "required name=search_term_string"
+  },
+  "publisher": {
+    "@type": "Organization",
+    "name": "{{publisher_name}}",
+    "logo": {
+      "@type": "ImageObject",
+      "url": "{{logo_url}}"
+    }
+  }
+}