perf(worker): 解耦准入调度与远端执行

原因：线上 P24 同构验收确认两台香港 Worker 的全局容量为 48，但跨地域逐行准入事务每轮只能形成 8 个活跃租约，队列最老等待超过 15 分钟。\n\n影响：新增可配置的异步准入 dispatcher 角色；生产两地 API 负责准入和过期回收，Worker 仅执行 River job。当前主库同站点 API 可低延迟填满容量，主库切换后另一地 API 通过既有数据库锁安全接管；未配置环境变量时保持原 Worker 一体化行为。\n\n验证：Go 全量测试、go vet、gofmt、真实 PostgreSQL 1000 任务双进程回归、前端 lint/test/build、Kubernetes server-side dry-run、Compose、ShellCheck、cluster/manual release tests 全部通过。

apps/api/internal/httpapi/async_worker_acceptance_integration_test.go

@@ -136,33 +136,37 @@ func TestAsyncWorkerThousandConcurrentSchedulingAcceptance(t *testing.T) {
 	serverCtx, cancelServer := context.WithCancel(ctx)
 	defer cancelServer()
 	server := httptest.NewServer(NewServerWithStores(serverCtx, config.Config{
-		AppEnv:                            "test",
-		HTTPAddr:                          ":0",
-		DatabaseURL:                       databaseURL,
-		IdentityMode:                      "hybrid",
-		JWTSecret:                         "test-secret",
-		BillingEngineMode:                 "observe",
-		CORSAllowedOrigin:                 "*",
-		ProcessRole:                       "api",
-		AsyncQueueWorkerEnabled:           true,
-		AsyncWorkerHardLimit:              1000,
-		AsyncWorkerInstanceHardLimit:      1000,
-		AsyncWorkerRefreshIntervalSeconds: 1,
+		AppEnv:                             "test",
+		HTTPAddr:                           ":0",
+		DatabaseURL:                        databaseURL,
+		IdentityMode:                       "hybrid",
+		JWTSecret:                          "test-secret",
+		BillingEngineMode:                  "observe",
+		CORSAllowedOrigin:                  "*",
+		ProcessRole:                        "api",
+		AsyncQueueWorkerEnabled:            true,
+		AsyncAdmissionDispatcherEnabled:    true,
+		AsyncAdmissionDispatcherConfigured: true,
+		AsyncWorkerHardLimit:               1000,
+		AsyncWorkerInstanceHardLimit:       1000,
+		AsyncWorkerRefreshIntervalSeconds:  1,
 	}, apiDB, apiCoordinationDB, apiDB, slog.New(slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{Level: slog.LevelError}))))
 	defer server.Close()
 	workerServer := httptest.NewServer(NewServerWithStores(serverCtx, config.Config{
-		AppEnv:                            "test",
-		HTTPAddr:                          ":0",
-		DatabaseURL:                       databaseURL,
-		IdentityMode:                      "hybrid",
-		JWTSecret:                         "test-secret",
-		BillingEngineMode:                 "observe",
-		CORSAllowedOrigin:                 "*",
-		ProcessRole:                       "worker",
-		AsyncQueueWorkerEnabled:           true,
-		AsyncWorkerHardLimit:              1000,
-		AsyncWorkerInstanceHardLimit:      1000,
-		AsyncWorkerRefreshIntervalSeconds: 1,
+		AppEnv:                             "test",
+		HTTPAddr:                           ":0",
+		DatabaseURL:                        databaseURL,
+		IdentityMode:                       "hybrid",
+		JWTSecret:                          "test-secret",
+		BillingEngineMode:                  "observe",
+		CORSAllowedOrigin:                  "*",
+		ProcessRole:                        "worker",
+		AsyncQueueWorkerEnabled:            true,
+		AsyncAdmissionDispatcherEnabled:    false,
+		AsyncAdmissionDispatcherConfigured: true,
+		AsyncWorkerHardLimit:               1000,
+		AsyncWorkerInstanceHardLimit:       1000,
+		AsyncWorkerRefreshIntervalSeconds:  1,
 	}, workerDB, workerCoordinationDB, workerDB, slog.New(slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{Level: slog.LevelError}))))
 	defer workerServer.Close()
 

apps/api/internal/httpapi/server.go

@@ -138,6 +138,9 @@ func NewServerWithStores(
 			logger.Info("asynchronous queue worker disabled for this process")
 		}
 	}
+	if cfg.RunsAsyncAdmissionDispatcher() {
+		server.runner.StartAsyncAdmissionDispatcher(ctx)
+	}
 	if cfg.RunsBackgroundWorkers() {
 		server.runner.StartBillingSettlementWorker(ctx)
 		server.runner.StartTaskHistoryWorkers(ctx)