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)

infra/prod/docker-compose.prod.yml

@@ -1,16 +1,16 @@
 services:
   app:
-    image: gitea.malio.fr/malio-dev/coltura:${COLTURA_IMAGE_TAG:-latest}
-    container_name: coltura-app
+    image: gitea.malio.fr/malio-dev/starseed:${STARSEED_IMAGE_TAG:-latest}
+    container_name: starseed-app
     env_file: .env
     ports:
       - "8086:80"
     volumes:
       - ./config/jwt:/var/www/html/config/jwt:ro
-      - coltura_logs:/var/www/html/var/log
+      - starseed_logs:/var/www/html/var/log
     extra_hosts:
       - "host.docker.internal:host-gateway"
     restart: unless-stopped
 
 volumes:
-  coltura_logs:
+  starseed_logs: