Port the LabelTask resource (labels attached to a task) from the frozen
/api/v1 to the Huma-backed /api/v2 as nested routes under
/tasks/{projecttask}/labels:
- GET list the labels on a task (read access to the task)
- POST attach a label to a task (write access to the task + access to the label)
- DELETE detach a label from a task (write access to the task)
There is no read-one or update for a label-task relation, so no
max_permission. Adds doc tags and marks the server-set created timestamp
readOnly on the shared model. Permissions stay enforced at the model
layer via the existing Can* methods through handler.Do*.
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