fix(acceptance): 隔离容量压测并稳定数据库连接

将协议模拟验收的供应商并发限额与 Worker 容量门禁分离，真实金丝雀继续保留生产限流。readyz 改用关键连接池并预热关键及 River 池，延长生产连接空闲周期，降低跨地域连接抖动。失败 Run 现在可以原子替换且失败报告记录任务数量，避免 validation 之间短暂放开正式流量。\n\n验证：Go 全量测试、go vet、PostgreSQL 集成测试、ShellCheck、迁移安全、发布脚本、pnpm lint/test/build、OpenAPI 无漂移均通过。

apps/api/internal/runner/admission.go

@@ -146,7 +146,11 @@ func (s *Service) buildTaskAdmissionPlanForCurrentBinding(
 				ModelType: modelType,
 			}, nil
 		}
-		if err := s.store.CheckRateLimits(ctx, s.rateLimitReservations(ctx, user, candidate, body)); err != nil {
+		reservations := acceptanceInfrastructureReservations(
+			task,
+			s.rateLimitReservations(ctx, user, candidate, body),
+		)
+		if err := s.store.CheckRateLimits(ctx, reservations); err != nil {
 			return taskAdmissionPlan{}, err
 		}
 		return taskAdmissionPlan{
@@ -206,8 +210,17 @@ func acceptanceAdmissionScopes(task store.GatewayTask, scopes []store.AdmissionS
 	}
 	out := append([]store.AdmissionScope(nil), scopes...)
 	for index := range out {
+		// Protocol-emulated acceptance measures Gateway and Worker capacity, so
+		// the isolated Run is bounded by the worker_capacity scope instead of a
+		// production supplier quota. The real acceptance_canary path deliberately
+		// retains the production platform-model concurrency limit.
+		if task.RunMode == "acceptance" && out[index].ScopeType == "platform_model" {
+			out[index].ConcurrentLimit = 0
+		}
 		if out[index].ConcurrentLimit <= 0 {
-			continue
+			if task.RunMode != "acceptance" || out[index].ScopeType != "platform_model" {
+				continue
+			}
 		}
 		out[index].QueueLimit = acceptanceQueueLimit
 		out[index].MaxWaitSeconds = acceptanceQueueMaxWait
@@ -215,6 +228,23 @@ func acceptanceAdmissionScopes(task store.GatewayTask, scopes []store.AdmissionS
 	return out
 }
 
+func acceptanceInfrastructureReservations(
+	task store.GatewayTask,
+	reservations []store.RateLimitReservation,
+) []store.RateLimitReservation {
+	if task.RunMode != "acceptance" {
+		return reservations
+	}
+	out := make([]store.RateLimitReservation, 0, len(reservations))
+	for _, reservation := range reservations {
+		if reservation.ScopeType == "platform_model" && reservation.Metric == "concurrent" {
+			continue
+		}
+		out = append(out, reservation)
+	}
+	return out
+}
+
 func (s *Service) loadAsyncTaskAdmission(ctx context.Context, task store.GatewayTask) (*store.TaskAdmission, error) {
 	if !task.AsyncMode {
 		return nil, nil
@@ -420,7 +450,11 @@ func (s *Service) ensureCandidateAdmission(
 		}
 		return store.TaskAdmissionResult{}, false, nil
 	}
-	if err := s.store.CheckRateLimits(ctx, s.rateLimitReservations(ctx, user, candidate, body)); err != nil {
+	reservations := acceptanceInfrastructureReservations(
+		task,
+		s.rateLimitReservations(ctx, user, candidate, body),
+	)
+	if err := s.store.CheckRateLimits(ctx, reservations); err != nil {
 		return store.TaskAdmissionResult{}, true, err
 	}
 	plan := taskAdmissionPlan{