Remove the creator-id fallback from get-webhooks-permissions.
Previously, the webhook creator could always edit/delete their
webhook even after being removed from the team. Now can-edit
comes from team role only — removed users get :not-found.
Webhooks are NOT deleted on member removal; the team owns them
and team admins/owners manage them.
AI-assisted-by: mimo-v2.5
Use team role check (check-edition-permissions!) for create-webhook
instead of the custom check that allowed any team member to create
webhooks via creator-id self-match override.
AI-assisted-by: mimo-2.5-pro
this allows almost all api operations to success usin application/json
encoding with the exception of the update-file, which we need to
approach a bit differently;
the reason update-file is different, is because the operations vector
is right now defined without the context of shape type, so we are just
unable to properly parse the value to correct type using the schema
decoding mechanism
