docs: add SEO/ASO research document (#26)

[rajesh-puripanda]

Summary

This PR adds a comprehensive SEO and ASO (AI Search Optimization) research document for shabble.xyz, based on a thorough codebase audit.

What's included

• docs/seo-aso-research.md — A full research document covering:

Current SEO State Analysis

• Audit of existing meta tags, structured data, sitemap, robots.txt
• Current metadata: weak title/description, missing OG tags, no JSON-LD, no sitemap, no robots.txt

On-Page SEO Recommendations

• Strengthened meta tags with keywords and title templates
• Open Graph and Twitter Card metadata additions
• JSON-LD structured data (WebApplication schema)
• Sitemap.xml and robots.txt implementation
• Canonical URL configuration

Technical SEO Recommendations

• Core Web Vitals optimization (CLS prevention for ads, lazy-loading non-critical JS)
• SSR/SSG improvements (Server Components already used)
• Crawl budget considerations

ASO (AI Search Optimization) for LLM/RAG Systems

• How to make the site discoverable by ChatGPT Search, Perplexity, Google AI Overviews
• Semantic HTML, clear content hierarchy, FAQ schema
• Suggested "About" blurb with natural language keyword coverage
• Actionable recommendations for AI crawler optimization

Action Items

• 15 concrete tasks with effort estimates (Low/Medium/High) and priorities
• Immediate, short-term, and medium-term roadmaps
• Success measurement metrics and baselines

Closes #26

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