feat: add application queue priority routing

gateway/internal/queue/messages.go

@@ -34,6 +34,7 @@ type SubmitCommand struct {
 	Signature     string `json:"signature"`
 	TemplateID    string `json:"templateId"`
 	BillingUnits  int    `json:"billingUnits"`
+	QueuePriority string `json:"queuePriority"`
 	Route         Route  `json:"route"`
 	CMPP          CMPP   `json:"cmpp"`
 	Retry         Retry  `json:"retry"`

gateway/internal/queue/messages_test.go

@@ -0,0 +1,50 @@
+package queue
+
+import (
+	"encoding/json"
+	"testing"
+)
+
+func TestSubmitCommandUnmarshalsQueuePriority(t *testing.T) {
+	payload := []byte(`{
+		"schemaVersion": "v1",
+		"messageType": "SubmitCommand",
+		"traceId": "trace-queue-0001",
+		"messageId": "msg-queue-0001",
+		"channelId": "channel-1",
+		"createdAt": "2026-07-07T10:00:00Z",
+		"tenantId": "tenant-1",
+		"applicationId": "app-1",
+		"submitId": "submit-1",
+		"phoneNumber": "13800138000",
+		"content": "hello",
+		"signature": "测试",
+		"templateId": "tpl-1",
+		"billingUnits": 1,
+		"queuePriority": "priority",
+		"route": {
+			"channelCode": "CMPP-A",
+			"cmppAccountCode": "account-a",
+			"priority": 1,
+			"rateLimitPerSecond": 100
+		},
+		"cmpp": {
+			"serviceId": "SMS",
+			"srcId": "10690000",
+			"registeredDelivery": 1,
+			"msgFmt": 8
+		},
+		"retry": {
+			"attempt": 0,
+			"maxAttempts": 3
+		}
+	}`)
+
+	var command SubmitCommand
+	if err := json.Unmarshal(payload, &command); err != nil {
+		t.Fatalf("unmarshal submit command: %v", err)
+	}
+	if command.QueuePriority != "priority" {
+		t.Fatalf("QueuePriority = %q, want priority", command.QueuePriority)
+	}
+}