Port the standalone bucket list/create/update/delete from v1 to the
Huma-backed /api/v2, under /projects/{project}/views/{view}/buckets,
using v2 verb conventions (POST creates, PUT updates). The handlers
reuse the generic handler.Do* functions, so permissions are enforced
by the Bucket model's existing Can* methods.
Mirrors v1: no read-one route (the model has no ReadOne/CanRead), so
AutoPatch synthesises no PATCH. No model changes.
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