fix: Neutralize fake calibration and demote forensic heuristic

fix: Add GPU inference semaphore, thread-safe registry, eager model loading

fix: Add per-endpoint request timeouts to prevent hanging

fix: Escape all user-controlled HTML to prevent XSS

feat: Add production infrastructure, CI/CD, Docker, tests, and implementation plan

feat: Add v2 architecture — FastAPI + Gradio, core pipeline, CorefakeNet, training suite