Félix Malfait 895bb58fc6 feat: add S3 presigned URL redirect for file downloads (#18864)
## Summary

- When `STORAGE_S3_PRESIGNED_URL_BASE` is configured, the file
controller returns a **302 redirect** to a presigned S3 URL instead of
proxying every byte through the server. This eliminates server bandwidth
and CPU overhead for S3-backed deployments.
- For local storage or S3 without a public endpoint, behavior is
unchanged (stream + pipe with security headers).
- Added `getPresignedUrl` to the `StorageDriver` interface (required
method returning `string | null`), with implementations in S3Driver
(uses a separate presign client with the public endpoint), LocalDriver
(returns `null`), and ValidatedStorageDriver (path traversal protection
+ delegation).
- Added a unified `getFileResponseById` method in `FileService` that
performs a single DB lookup and returns either a redirect URL or a
stream, avoiding double lookups.
- Extracted `getContentDisposition` from the header util so both the
proxy path and presigned URL path share the same inline/attachment
allowlist.
- Added MinIO service to `docker-compose.dev.yml` (optional `s3`
profile) for local S3 testing.
- Documented S3 presigned URL setup, CORS, and `nosniff` requirements in
the self-hosting docs.

## Test plan

- [x] All 63 unit tests pass across 5 test suites (util, S3 driver,
validated driver, file storage service, controller)
- [x] `npx nx typecheck twenty-server` passes
- [ ] Manual E2E test with MinIO: `docker compose --profile s3 up -d`,
configure S3 env vars, verify `curl -I` returns 302 with `Location`
header pointing to MinIO
- [ ] Verify local storage (no `STORAGE_S3_PRESIGNED_URL_BASE`) still
streams files with 200 + security headers
- [ ] Verify public assets endpoint still proxies (no redirect)


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