Consolidate Docker, Nginx, and deploy configs from 5 scattered directories
(docker/, deploy/docker/, deploy/nginx/, script/) into a single infra/ tree
with dev/ and prod/ subdirectories. Update all references in docker-compose,
Makefile, CI workflows, Dockerfiles, and documentation.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Secrets moved to .env.local (gitignored). Added .env.example for new developers.
Also added .idea/ and docker/.env.docker.local to .gitignore and removed them from tracking.
Tickets: T-001, T-013, T-018
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>