Add --data-dir option to all CLI commands, allowing users to override
the default ~/.paperclip root for config, context, database, logs, and
storage. Includes preAction hook to auto-derive --config and --context
paths when --data-dir is set. Add unit tests and doc updates.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Reject requests from unrecognised Host headers when running
authenticated/private. Adds server middleware, CLI `allowed-hostname`
command, config-schema field, and prompt support for configuring
allowed hostnames during onboard/configure.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>