Audit EGFP protein page performance

[tlambert03]

This commit implements several performance improvements for the protein detail page based on Lighthouse audit findings:

1. Database Query Optimization:

   • Add prefetch_related for references, transitions, and bleach_measurements
   • Add select_related for parent_organism and lineage relations
   • Reduces N+1 queries on protein detail page

2. Resource Hints:

   • Add preconnect/dns-prefetch for Google Analytics domains
   • Add preconnect/dns-prefetch for Algolia search API
   • Improves initial connection time for third-party resources

3. JavaScript Optimization:

   • Extract inline scripts from protein_detail.html to protein_page.js
   • Convert lineage chart to use IntersectionObserver for lazy loading
   • Lineage chart now only loads when scrolled into view (200px threshold)
   • Reduces initial JavaScript parse/execution time

4. Code Quality:

   • Replace inline mutation toggle function with reusable external function
   • Improve error handling for lineage chart loading failures
   • Better separation of concerns between template and JavaScript

Expected Impact:

• Reduced database queries (fewer round trips)
• Faster third-party resource loading (earlier DNS resolution)
• Reduced initial JavaScript execution (deferred lineage chart)
• Smaller HTML payload (extracted inline scripts)