Add S3/MinIO storage, nelmio security and CSP config
- Flysystem S3 adapter configured for MinIO
- Vich uploader switched to Flysystem S3 storage
- Liip imagine loader/resolver on S3
- S3 client service with path style endpoint for MinIO
- Nelmio security: CSP, clickjacking, permissions policy, external redirects
- CSP dev: allow Vite HMR (localhost:5173)
- CSP prod: nonce scripts, restricted form-action and connect-src
- composer: flysystem-bundle, flysystem-aws-s3-v3, nelmio/security-bundle
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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