Changes

PR #2093 by alecjmckanna: feat: add --readpattern flag to print pattern contents to terminal

• Adds a new --readpattern <name> CLI flag that prints the raw contents of a named pattern's system.md file to stdout, making it easy to inspect a pattern's instructions without navigating the filesystem manually.
• Custom pattern directories are respected: the user's custom patterns directory is checked first before falling back to the main patterns directory, consistent with all other pattern lookups.

Direct commits

• Docs: update Docker config mount path for appuser

• Replace container config mount path from root to appuser

• Align setup example with non-root container home directory

• Align pattern usage example with appuser config location

• Align REST API example with updated config mount target

• Update English and Chinese README Docker instructions consistently