fix(acceptance): 为高并发验收启用有界排队

生产同构 Gemini 千请求在真实候选并发饱和后因 queueing disabled 返回 429，同时单台压测机建立千条 WAN TCP 产生连接层 reset。仅对 acceptance 与 acceptance_canary 覆盖为 10000 条、最长 15 分钟的有界等待队列，保留候选原始并发和 RPM/TPM 上限；压测传输强制 HTTP/2 复用连接，避免单源连接风暴。正式 production 策略不变。\n\n验证：acceptance-load 与 runner 定向测试通过，新增生产策略不变和验收队列边界单测；gofmt、bash -n、ShellCheck、git diff --check 通过。

apps/api/cmd/acceptance-load/main.go

@@ -196,6 +196,7 @@ func run(ctx context.Context, opts options) ([]phaseResult, error) {
 			MaxIdleConns:        2048,
 			MaxIdleConnsPerHost: 1024,
 			MaxConnsPerHost:     1024,
+			ForceAttemptHTTP2:   true,
 			TLSClientConfig:     tlsConfig,
 		},
 	}

apps/api/internal/runner/admission.go

@@ -32,6 +32,8 @@ const (
 	asyncWorkerCapacityScopeKey = "global"
 	asyncWorkerQueueLimit       = 10000
 	asyncWorkerMaxWaitSeconds   = 24 * 60 * 60
+	acceptanceQueueLimit        = 10000
+	acceptanceQueueMaxWait      = 15 * 60
 )
 
 func distributedAdmissionModelType(modelType string) bool {
@@ -117,6 +119,7 @@ func (s *Service) buildTaskAdmissionPlan(ctx context.Context, task store.Gateway
 				return taskAdmissionPlan{}, err
 			}
 		}
+		scopes = acceptanceAdmissionScopes(task, scopes)
 		hasConcurrentLimit := false
 		for _, scope := range scopes {
 			if scope.ConcurrentLimit > 0 {
@@ -168,6 +171,21 @@ func (s *Service) withAsyncWorkerCapacityScope(ctx context.Context, scopes []sto
 	return out, nil
 }
 
+func acceptanceAdmissionScopes(task store.GatewayTask, scopes []store.AdmissionScope) []store.AdmissionScope {
+	if task.RunMode != "acceptance" && task.RunMode != "acceptance_canary" {
+		return scopes
+	}
+	out := append([]store.AdmissionScope(nil), scopes...)
+	for index := range out {
+		if out[index].ConcurrentLimit <= 0 {
+			continue
+		}
+		out[index].QueueLimit = acceptanceQueueLimit
+		out[index].MaxWaitSeconds = acceptanceQueueMaxWait
+	}
+	return out
+}
+
 func (s *Service) tryTaskAdmission(ctx context.Context, task store.GatewayTask, plan taskAdmissionPlan, waiterID string) (store.TaskAdmissionResult, error) {
 	return s.tryTaskAdmissionWithAdmittedHook(ctx, task, plan, waiterID, nil)
 }
@@ -313,6 +331,7 @@ func (s *Service) ensureCandidateAdmission(
 			return store.TaskAdmissionResult{}, true, err
 		}
 	}
+	scopes = acceptanceAdmissionScopes(task, scopes)
 	hasConcurrentLimit := false
 	for _, scope := range scopes {
 		if scope.ConcurrentLimit > 0 {

apps/api/internal/runner/admission_test.go

@@ -1,6 +1,10 @@
 package runner
 
-import "testing"
+import (
+	"testing"
+
+	"github.com/easyai/easyai-ai-gateway/apps/api/internal/store"
+)
 
 func TestDistributedAdmissionModelTypeBoundary(t *testing.T) {
 	for _, modelType := range []string{
@@ -19,3 +23,41 @@ func TestDistributedAdmissionModelTypeBoundary(t *testing.T) {
 		}
 	}
 }
+
+func TestAcceptanceAdmissionScopesEnableBoundedQueueWithoutChangingConcurrency(t *testing.T) {
+	input := []store.AdmissionScope{{
+		ScopeType:       "platform_model",
+		ScopeKey:        "model-1",
+		ConcurrentLimit: 10,
+		QueueLimit:      0,
+		MaxWaitSeconds:  0,
+	}}
+
+	got := acceptanceAdmissionScopes(store.GatewayTask{RunMode: "acceptance"}, input)
+
+	if got[0].ConcurrentLimit != 10 {
+		t.Fatalf("acceptance must preserve the production concurrency limit, got %+v", got[0])
+	}
+	if got[0].QueueLimit != acceptanceQueueLimit || got[0].MaxWaitSeconds != acceptanceQueueMaxWait {
+		t.Fatalf("acceptance must enable a bounded queue, got %+v", got[0])
+	}
+	if input[0].QueueLimit != 0 || input[0].MaxWaitSeconds != 0 {
+		t.Fatalf("acceptance queue overlay must not mutate the production scopes, got %+v", input[0])
+	}
+}
+
+func TestAcceptanceAdmissionScopesLeaveProductionPolicyUnchanged(t *testing.T) {
+	input := []store.AdmissionScope{{
+		ScopeType:       "platform_model",
+		ScopeKey:        "model-1",
+		ConcurrentLimit: 10,
+		QueueLimit:      3,
+		MaxWaitSeconds:  7,
+	}}
+
+	got := acceptanceAdmissionScopes(store.GatewayTask{RunMode: "production"}, input)
+
+	if got[0].QueueLimit != 3 || got[0].MaxWaitSeconds != 7 || got[0].ConcurrentLimit != 10 {
+		t.Fatalf("production admission policy changed: %+v", got[0])
+	}
+}

apps/api/internal/runner/service.go

@@ -525,6 +525,7 @@ func (s *Service) executeWithToken(ctx context.Context, task store.GatewayTask,
 	admittedPlatformModelID := ""
 	if distributedAdmission && len(candidates) > 0 {
 		admissionScopes, groupID := s.admissionScopes(ctx, user, candidates[0])
+		admissionScopes = acceptanceAdmissionScopes(task, admissionScopes)
 		hasConcurrentLimit := false
 		for _, scope := range admissionScopes {
 			if scope.ConcurrentLimit > 0 {