fix: 三端联调测试 2 P1 + 2 P2 + 4 P3 修复

P1-07: billing get_or_create_usage 同步 max_* 列到当前计划限额
P1-08: relay handler 增加直接配额检查 (relay_requests/input/output_tokens)
P2-09: relay failover 成功后记录 tokens 并标记 completed
P2-10: Tauri agentStore saas-relay 模式下从 SaaS API 获取真实用量
P2-14: super_admin 合成 subscription + check_quota 放行
P3-19: 新建 ApiKeys.tsx 页面替代 ModelServices 路由
P3-15: antd destroyOnClose → destroyOnHidden (3处)
P3-16: ProTable onSearch → onSubmit (2处)

crates/zclaw-saas/src/billing/handlers.rs

@@ -39,9 +39,23 @@ pub async fn get_subscription(
     let sub = service::get_active_subscription(&state.db, &ctx.account_id).await?;
     let usage = service::get_or_create_usage(&state.db, &ctx.account_id).await?;
 
+    // P2-14 修复: super_admin 无订阅时合成一个 "active" subscription
+    let sub_value = if sub.is_none() && ctx.role == "super_admin" {
+        Some(serde_json::json!({
+            "id": format!("sub-admin-{}", &ctx.account_id.chars().take(8).collect::<String>()),
+            "account_id": ctx.account_id,
+            "plan_id": plan.id,
+            "status": "active",
+            "current_period_start": usage.period_start,
+            "current_period_end": usage.period_end,
+        }))
+    } else {
+        sub.map(|s| serde_json::to_value(s).unwrap_or_default())
+    };
+
     Ok(Json(serde_json::json!({
         "plan": plan,
-        "subscription": sub,
+        "subscription": sub_value,
         "usage": usage,
     })))
 }