chore : rename Coltura to Starseed

- Rename project name across code, configs, docs, dev/prod infra
- Dev: DOCKER_APP_NAME + POSTGRES_DB switched to starseed, containers become php-starseed-fpm / nginx-starseed / starseed-db-1
- Dev: mount nginx.conf on default.conf instead of starseed.conf to avoid alphabetical-order clash with image's default site
- Makefile: export CURRENT_UID/CURRENT_GID at top level so docker compose builds (db-reset etc.) get them
- Prod: image registry path, container_name, volumes, vhost server_name + paths, DATABASE_URL, CORS, CI workflow
- Add doc/prompt-rename-prod.md with the migration runbook for the prod server (DB rename, FS move, vhost, Let's Encrypt)

makefile

@@ -9,6 +9,12 @@ ENV_FILE    := $(if $(wildcard $(ENV_LOCAL)),$(ENV_LOCAL),$(ENV_DEFAULT))
 include $(ENV_DEFAULT)
 -include $(ENV_LOCAL)
 
+# Export du UID/GID host pour que docker compose les voie dans toutes les targets
+# (sinon le build du Dockerfile dev fail sur `usermod -u ${CURRENT_UID}` quand l'image
+# n'est pas en cache, ex: apres renommage du compose project).
+export CURRENT_UID := $(shell id -u)
+export CURRENT_GID := $(shell id -g)
+
 PHP_CONTAINER				= php-$(DOCKER_APP_NAME)-fpm
 SYMFONY_CONSOLE				= $(EXEC_PHP) php bin/console
 
@@ -26,7 +32,7 @@ FILES						=
 
 # Affiche l'aide — cible par defaut (make ou make help)
 help:
-	@printf "\n  \033[1mColtura — Commandes make\033[0m\n\n"
+	@printf "\n  \033[1mStarseed — Commandes make\033[0m\n\n"
 	@printf "  \033[1;33mContainers\033[0m\n"
 	@printf "    \033[36m%-28s\033[0m %s\n" "start"                    "Demarrer les containers Docker"
 	@printf "    \033[36m%-28s\033[0m %s\n" "stop"                     "Arreter les containers"