refactor : reorganize infra files into infra/dev and infra/prod

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>

infra/dev/php.ini

@@ -0,0 +1,8 @@
+[Date]
+; Defines the default timezone used by the date functions
+; http://php.net/date.timezone
+date.timezone = Europe/Paris
+
+[Upload]
+upload_max_filesize = 50M
+post_max_size = 55M