Every admin endpoint now resolves Capability for the loaded resource
and calls authz::require(...) before mutating. Forbidden → 403; every
handler State carries an Arc<dyn AuthzRepo>, plumbed from the new
PostgresAppMembersRepository in the picloud binary.
* api.rs (scripts): AppRead/AppWriteScript/AppLogRead bound to
script.app_id after load. List branches on instance_role:
Member → list_for_user, others → list (or ?app= filtered).
* apps_api.rs: InstanceCreateApp on POST; AppRead on get/list_domains;
AppAdmin on patch/delete/slug:check; AppManageDomains on
create_domain/delete_domain. list_apps membership-filters for Member.
* admin_users_api.rs: InstanceManageUsers on every endpoint. Mint +
PATCH refuse to grant Owner unless the caller is already Owner
(CannotEscalate / 422), on top of the existing last-owner guard.
* route_admin.rs: AppRead on list/check/match; AppWriteRoute on
create/delete bound to the route's actual app_id (added a
RouteRepository::get(uuid) lookup so delete binds correctly).
* AppRepository + ScriptRepository gain list_for_user(user_id) for
membership-filtered listings.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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