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ae27058b0a
Fix attachment download for self-hosted deployments using private S3-compatible buckets without CloudFront. Closes #3721. **Server** - New unified `GET /api/attachments/{id}/download` endpoint that picks CloudFront / S3 presign / server proxy at request time. - `ATTACHMENT_DOWNLOAD_MODE=auto|cloudfront|presign|proxy` and `ATTACHMENT_DOWNLOAD_URL_TTL` env knobs; `auto` routes Docker hostnames / localhost / private IPs through the proxy and public S3 endpoints through presign. - `Storage.PresignGet` capability; S3 implementation generates presigned GET URLs. - `attachmentToResponse` returns the unified relative endpoint instead of leaking raw unsigned S3 URLs when CloudFront is not configured. Proxy path streams via `io.Copy` with `Content-Disposition` / `Content-Length` / `Cache-Control: no-store` / `X-Content-Type-Options: nosniff`. **Clients** - CLI / Desktop / Mobile resolve relative `download_url` values against the configured API base. Desktop covers the Electron native download bridge and the media preview modal; Mobile covers `Linking.openURL`, the markdown image RN loader, and the composer's completed non-image file chip. - Mobile gains a minimal Node-environment vitest lane wired into `mobile-verify.yml`. **Docs** - `.env.example`, `docker-compose.selfhost.yml`, `SELF_HOSTING_ADVANCED.md`, and the `environment-variables` doc set updated with the new env keys and the `ATTACHMENT_DOWNLOAD_MODE=proxy` recommendation for Docker / VPC-internal object stores. **Tests** - `internal/storage`, `internal/cli`, `internal/handler` (download endpoint, mode selection, proxy header, `/content` non-regression), `cmd/server` (trusted proxy parser). - `packages/views/editor/use-download-attachment.test.tsx` and `attachment-preview-modal.test.tsx` exercise relative URL resolution + absolute pass-through. - `apps/mobile/lib/attachment-url.test.ts` covers every helper branch plus the composer non-image chip case.