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/scripts/requirements.txt

@@ -0,0 +1,40 @@
+# OurDigital SEO Audit - Python Dependencies
+# Install with: pip install -r requirements.txt
+
+# Google APIs
+google-api-python-client>=2.100.0
+google-auth>=2.23.0
+google-auth-oauthlib>=1.1.0
+google-auth-httplib2>=0.1.1
+google-analytics-data>=0.18.0
+
+# Notion API
+notion-client>=2.0.0
+
+# Web Scraping & Parsing
+lxml>=5.1.0
+beautifulsoup4>=4.12.0
+extruct>=0.16.0
+requests>=2.31.0
+aiohttp>=3.9.0
+
+# Schema Validation
+jsonschema>=4.21.0
+rdflib>=7.0.0
+
+# Google Trends
+pytrends>=4.9.2
+
+# Data Processing
+pandas>=2.1.0
+
+# Async & Retry
+tenacity>=8.2.0
+tqdm>=4.66.0
+
+# Environment
+python-dotenv>=1.0.0
+
+# Logging & CLI
+rich>=13.7.0
+typer>=0.9.0