fix(api): inscription parent — body 15mb, uploads persistants, 409 si unique PG

- NestExpressApplication + useBodyParser json/urlencoded 15mb
- UPLOAD_PHOTOS_DIR: résolution chemin absolu/relatif + doc .env.example / proxy
- docker-compose: volume backend_uploads + UPLOAD_PHOTOS_DIR par défaut
- Map erreur PostgreSQL 23505 → ConflictException (parent + AM)
- Logs Nest si échec SMTP après inscription (email déjà géré)

Made-with: Cursor

docker-compose.yml

@@ -57,6 +57,10 @@ services:
       NODE_ENV: ${NODE_ENV}
       LOG_API_REQUESTS: ${LOG_API_REQUESTS:-false}
       CONFIG_ENCRYPTION_KEY: ${CONFIG_ENCRYPTION_KEY}
+      # Photos inscription (base64) — chemin absolu dans le conteneur (voir volume backend_uploads)
+      UPLOAD_PHOTOS_DIR: ${UPLOAD_PHOTOS_DIR:-/app/uploads/photos}
+    volumes:
+      - backend_uploads:/app/uploads/photos
     depends_on:
       - database
     labels:
@@ -94,6 +98,7 @@ services:
 
 volumes:
   postgres_data:
+  backend_uploads:
 
 networks:
   ptitspas_network: