Own route beside library and queues. Roots edit kind, audience, path
and their policy; policies get a form over the real fields — size
bands as number inputs, score and source weights as numbers,
resolution preference and audio/HDR rules as validated lists. Delete
arms before firing; a 409 from a referenced policy or occupied root
surfaces its message.
Policies and roots were editable only via SQL inside the container.
Full CRUD over both, validated against the vocabulary the policy
engine knows — unknown resolutions or sources answer 422 naming the
field, malformed JSON answers 422, deleting a referenced policy or an
occupied root answers 409. Closes#116 (API half).
Miguel Palhas