Phase 18.1 needs ffmpeg (libopus). Add it to bootstrap.sh apt prereqs and a
preflight guard in install.sh; resolves via the systemd user unit's default
PATH (/usr/bin), no config change.
Four Gitea workflows (deploy-public, deploy-manager, deploy-api,
package-install) and a complete deploy/ folder: bootstrap, install,
ssh-wrapper, three deploy scripts, setup-step10-creds, three systemd
user units, two nginx vhost templates. Models Skipper's deploy
infrastructure with key deviations: flat csproj paths, dual PostgreSQL
databases, FileDatabase vault directory (never touched on deploy), EF
bundle covers DeepDrftContext only (AuthBlocks self-migrates at boot),
deploy-api reads DB connection from host credentials not CI args.
daniel-c-harvey