docs(wiki): update for v2.4.0 release (dual sign-in, email resilience, profile username)
docs(wiki): update with 35 tests, AI resilience, model fallback, structured logging, and health endpoint
docs(wiki): update architecture, calendar heatmap, rate limiting, testing, and API reference
Initialize FitTrack AI comprehensive documentation suite: AI vision, FitBot coach, health analytics, workout studio, and API reference