feat(api): bind encrypted workspaces to accounts and devices

packages/core/src/constants.ts

@@ -13,6 +13,7 @@ export const Flags = {
   Snapshot: 2,
   Gated: 4,
   Enc: 8,
+  Control: 16,
 } as const;
 
 /** 档位 padding 的明文长度(protocol §6)。 */