refactor: backend port 8000 → 7000 pour eviter conflits applicatifs

- Dockerfile: EXPOSE + CMD uvicorn --port 7000
- app/config.py: PORT default 8000 → 7000
- nginx default.conf: 6x proxy_pass backend:8000 → backend:7000
- docker-compose.prod.yml: BACKEND_PORT default 8001 → 7000, internal 7000
- docker-compose.yml (dev): 8000:8000 → 7000:7000
- imago-admin/docker-compose.yml: VITE_API_BASE_URL + port mapping → 7000
- .env.example: BACKEND_PORT=8001 → 7000
- deploy.sh: defaults + invites port 8001 → 7000

imago-admin/docker-compose.yml

@@ -3,7 +3,7 @@ services:
     build:
       context: .
       args:
-        VITE_API_BASE_URL: http://localhost:8000
+        VITE_API_BASE_URL: http://localhost:7000
     ports:
       - '3000:80'
     depends_on:
@@ -14,7 +14,7 @@ services:
     build:
       context: ..
     ports:
-      - '8000:8000'
+      - '7000:7000'
     volumes:
       - ../data:/app/data
     env_file: ../.env