Introduces a manifest contract so feature containers self-describe their
settings (JSON Schema + access rules). Backend and frontend gain generic
plugin proxy and dynamic Extensions UI with zero feature-specific code.
Doc-service is the first plugin consumer: exposes /plugin/manifest and
/plugin/settings, adds a watchdog-based file watcher that auto-ingests
PDFs from a mounted directory, maps subfolders to categories, supports
AI-suggested folder/filename (user-confirmed), and enforces a no-remove
policy. Access is gated by is_superuser or doc-service-admin group.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
curo1305