Add Exclusive Methodology page — Hidden Profit Index and proprietary algorithms; cross-link with Amazon, Glossary, Methodology, Cross-Platform overviews
feat: cross-link use cases with platform pages — bidirectional navigation Each use case now links to its platform guide. Each platform guide links back to relevant use cases ('See it in action').
Build wiki knowledge base: 10 pages covering all platforms, methodology, loop engineering, glossary, troubleshooting New pages: Getting-Started, Amazon-Overview, Shopee-Overview, 1688-Sourcing, Cross-Platform-Overview, Methodology-Overview, Loop-Engineering, Troubleshooting, Glossary Updated: Sidebar with full navigation, Home page