feat: 账本域 billing_domain 与成员支付可见性收紧

三表增加账本域标签，成员支付参数改为同域透明、跨域隔离、未标域默认藏；管理面登记/筛选/行内编辑与文档中心同步对齐。

packages/db/drizzle/0001_aromatic_hawkeye.sql

@@ -0,0 +1,3 @@
+ALTER TABLE "api_keys" ADD COLUMN "billing_domain" text;--> statement-breakpoint
+ALTER TABLE "subscriptions" ADD COLUMN "billing_domain" text;--> statement-breakpoint
+ALTER TABLE "topups" ADD COLUMN "billing_domain" text;

packages/db/drizzle/meta/_journal.json

@@ -8,6 +8,13 @@
       "when": 1791551016051,
       "tag": "0000_loose_goblin_queen",
       "breakpoints": true
+    },
+    {
+      "idx": 1,
+      "version": "7",
+      "when": 1791878178512,
+      "tag": "0001_aromatic_hawkeye",
+      "breakpoints": true
     }
   ]
 }