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>

makefile

@@ -1,6 +1,6 @@
 # Permet d'utiliser un .env.docker.local pour override
-ENV_DEFAULT = docker/.env.docker
-ENV_LOCAL   = docker/.env.docker.local
+ENV_DEFAULT = infra/dev/.env.docker
+ENV_LOCAL   = infra/dev/.env.docker.local
 ENV_FILE    := $(if $(wildcard $(ENV_LOCAL)),$(ENV_LOCAL),$(ENV_DEFAULT))
 
 # Permet d'avoir les variables du fichier .env.docker.local
@@ -23,13 +23,11 @@ FILES						=
 #========================================================================================
 
 env-init:
-	@mkdir -p docker
 	@cp --update=none $(ENV_DEFAULT) $(ENV_LOCAL)
 
 # Lance le container
 start: env-init
 	@echo "**** START CONTAINERS ****"
-	@cp --update=none docker/.env.docker docker/.env.docker.local
 	CURRENT_UID=$(shell id -u) CURRENT_GID=$(shell id -g) $(DOCKER_COMPOSE) up -d
 
 # Éteint le container