Bookmark manager (Go, single binary). Single container, SQLite in a
named volume. Default admin (shiori/gopher) is auto-created on first run.
Known issue: Shiori v1.7.0's SPA wizard detection panics with HTTP 500
on the first /api/bookmarks request when no session exists. The setup
wizard does NOT appear on first visit — log in with the default
credentials above and change the password immediately.
Port 8080 inside the sidecar namespace. Optional SHIORI_HTTP_SECRET_KEY
env var would persist sessions across restarts (not enabled by default).