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/breadcrumb.json

@@ -0,0 +1,24 @@
+{
+  "@context": "https://schema.org",
+  "@type": "BreadcrumbList",
+  "itemListElement": [
+    {
+      "@type": "ListItem",
+      "position": 1,
+      "name": "{{level_1_name}}",
+      "item": "{{level_1_url}}"
+    },
+    {
+      "@type": "ListItem",
+      "position": 2,
+      "name": "{{level_2_name}}",
+      "item": "{{level_2_url}}"
+    },
+    {
+      "@type": "ListItem",
+      "position": 3,
+      "name": "{{level_3_name}}",
+      "item": "{{level_3_url}}"
+    }
+  ]
+}