feat(object-storage): add bucket file management

[elitan]

Summary

• add bucket file browsing actions with upload, download, signed URL, key copy, and delete
• switch uploads/downloads to presigned S3 URLs with temporary scoped Garage keys and CORS setup
• reuse service domain settings UI for object storage endpoints and include wildcard system domains

Tests

• bun run typecheck
• bun --cwd apps/app test src/lib/object-storage.test.ts src/lib/object-storage-objects.test.ts src/lib/domains.test.ts
• bun run lint (passes with existing warnings in apps/app/src/lib/mcp/mcp-tools.test.ts)
• bun run build
• git diff --check

[frost-j4-labs]

Service	Status	Preview
frost	Ready	Visit

Updated: Aug 15, 2026 6:17pm UTC