feat: add application queue priority routing

api/prisma/migrations/20260707143000_add_application_queue_priority/migration.sql

@@ -0,0 +1,2 @@
+ALTER TABLE "SmsApplication" ADD COLUMN "queuePriority" TEXT NOT NULL DEFAULT 'normal';
+ALTER TABLE "SmsMessageRecord" ADD COLUMN "queuePriority" TEXT NOT NULL DEFAULT 'normal';

api/prisma/schema.prisma

@@ -339,6 +339,7 @@ model SmsApplication {
   secretHash            String
   dailyLimit            Int?
   customerUnitPrice     Int      @default(0)
+  queuePriority         String   @default("normal")
   maxPhonesPerTask      Int      @default(1000000)
   templateMismatchMode  String   @default("reject")
   status                String   @default("active")
@@ -852,6 +853,7 @@ model SmsMessageRecord {
   billingUnits     Int      @default(1)
   unitPrice        Int      @default(0)
   amountCents      Int      @default(0)
+  queuePriority    String   @default("normal")
   channelId        String?
   submitId         String?
   gatewayMessageId String?