fix: enforce carrier-specific channel group routing

api/prisma/migrations/20260703143000_add_channel_group_carrier/migration.sql

@@ -0,0 +1,3 @@
+ALTER TABLE "SmsChannelGroup" ADD COLUMN "carrier" TEXT NOT NULL DEFAULT 'mobile';
+
+CREATE UNIQUE INDEX "SmsChannelGroupItem_groupId_province_key" ON "SmsChannelGroupItem"("groupId", "province");

api/prisma/migrations/20260703152000_add_application_customer_rate/migration.sql

@@ -0,0 +1 @@
+ALTER TABLE "SmsApplication" ADD COLUMN "customerUnitPrice" INTEGER NOT NULL DEFAULT 0;

api/prisma/schema.prisma

@@ -338,6 +338,7 @@ model SmsApplication {
   callbackUrl           String?
   secretHash            String
   dailyLimit            Int?
+  customerUnitPrice     Int      @default(0)
   maxPhonesPerTask      Int      @default(1000000)
   templateMismatchMode  String   @default("reject")
   status                String   @default("active")
@@ -527,6 +528,7 @@ model SmsChannelGroup {
   code        String   @unique
   name        String
   description String?
+  carrier     String   @default("mobile")
   status      String   @default("active")
   retryEnabled Boolean  @default(true)
   retryTimeLimitHours Int @default(72)
@@ -553,6 +555,7 @@ model SmsChannelGroupItem {
   channel SmsChannel      @relation(fields: [channelId], references: [id])
 
   @@unique([groupId, channelId, carrier, province])
+  @@unique([groupId, province])
   @@index([channelId])
 }