Remove S3/Minio: delete s3_client service, env vars, Minio container, and AWS S3 package

- Remove s3_client service from services.yaml
- Remove S3_* env vars from .env and env.local.j2
- Remove Minio service and volume from docker-compose-dev.yml
- Remove league/flysystem-aws-s3-v3 from composer.json

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docker-compose-dev.yml

@@ -103,19 +103,6 @@ services:
     volumes:
       - vault-data:/vault/file
 
-  minio:
-    image: minio/minio:latest
-    container_name: e_ticket_minio
-    command: server /data --console-address ":9001"
-    environment:
-      MINIO_ROOT_USER: e_ticket
-      MINIO_ROOT_PASSWORD: e_ticket
-    ports:
-      - "9090:9000"
-      - "9001:9001"
-    volumes:
-      - minio-data:/data
-
   ngrok:
     image: ngrok/ngrok:latest
     container_name: e_ticket_ngrok
@@ -163,5 +150,4 @@ volumes:
   redis-data:
   bun-modules:
   vault-data:
-  minio-data:
   meilisearch-data: