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)

desktop/src/store/agentStore.ts

@@ -10,6 +10,7 @@ import type { AgentTemplateFull } from '../lib/saas-client';
 import { saasClient } from '../lib/saas-client';
 import { useChatStore } from './chatStore';
 import { useConversationStore } from './chat/conversationStore';
+import { getGatewayVersion } from './connectionStore';
 import { useSaaSStore } from './saasStore';
 import { createLogger } from '../lib/logger';
 
@@ -338,6 +339,22 @@ export const useAgentStore = create<AgentStore>((set, get) => ({
         byModel: {},
       };
 
+      // P2-10 修复: saas-relay 模式下从服务端获取真实用量
+      const gwVersion = getGatewayVersion();
+      if (gwVersion === 'saas-relay') {
+        try {
+          const sub = await saasClient.getSubscription();
+          if (sub?.usage) {
+            const serverTokens = (sub.usage.input_tokens ?? 0) + (sub.usage.output_tokens ?? 0);
+            if (serverTokens > 0) {
+              stats.totalTokens = serverTokens;
+            }
+          }
+        } catch {
+          // 降级到本地计数器
+        }
+      }
+
       set({ usageStats: stats });
     } catch {
       // Usage stats are non-critical, ignore errors silently