feat: Add GenAI & Agentic AI module (13 topics)

feat: add Vector DB, RAG, and Advanced LLM modules to Deep Learning hub

Rebuild Prompt Engineering Guide with dashboard UI and 4 new advanced modules

Add Python for Data Science & AI Masterclass module with 10 topics

feat: add Azure DevOps & MLOps module with 10 topic cards and 100 interview questions

fix: update copyright to 2026, fix search navigation for deployed sites

feat: Update all modules with latest UI enhancements and content