feat: 渠道展示、订阅套餐、系统配置全功能

- 新增 Channel / SubscriptionPlan / SystemConfig 三个数据模型
- Order 模型扩展支持订阅订单（order_type, plan_id, subscription_group_id）
- Sub2API client 新增分组查询、订阅分配/续期、用户订阅查询
- 订单服务支持订阅履约流程（CAS 锁 + 分组消失安全处理）
- 管理后台：渠道管理、订阅套餐管理、系统配置、Sub2API 分组同步
- 用户页面：双 Tab UI（按量付费/包月订阅）、渠道卡片、充值弹窗、订阅确认
- PaymentForm 支持 fixedAmount 固定金额模式
- 订单状态 API 返回 failedReason 用于订阅异常展示
- 数据库迁移脚本

prisma/migrations/20260313000000_add_channels_subscriptions_config/migration.sql

@@ -0,0 +1,66 @@
+-- CreateTable: channels
+CREATE TABLE "channels" (
+    "id" TEXT NOT NULL,
+    "group_id" INTEGER NOT NULL,
+    "name" TEXT NOT NULL,
+    "platform" TEXT NOT NULL DEFAULT 'claude',
+    "rate_multiplier" DECIMAL(10,4) NOT NULL,
+    "description" TEXT,
+    "models" TEXT,
+    "features" TEXT,
+    "sort_order" INTEGER NOT NULL DEFAULT 0,
+    "enabled" BOOLEAN NOT NULL DEFAULT true,
+    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updated_at" TIMESTAMP(3) NOT NULL,
+
+    CONSTRAINT "channels_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateTable: subscription_plans
+CREATE TABLE "subscription_plans" (
+    "id" TEXT NOT NULL,
+    "group_id" INTEGER NOT NULL,
+    "name" TEXT NOT NULL,
+    "description" TEXT,
+    "price" DECIMAL(10,2) NOT NULL,
+    "original_price" DECIMAL(10,2),
+    "validity_days" INTEGER NOT NULL DEFAULT 30,
+    "features" TEXT,
+    "for_sale" BOOLEAN NOT NULL DEFAULT false,
+    "sort_order" INTEGER NOT NULL DEFAULT 0,
+    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updated_at" TIMESTAMP(3) NOT NULL,
+
+    CONSTRAINT "subscription_plans_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateTable: system_configs
+CREATE TABLE "system_configs" (
+    "key" TEXT NOT NULL,
+    "value" TEXT NOT NULL,
+    "group" TEXT NOT NULL DEFAULT 'general',
+    "label" TEXT,
+    "updated_at" TIMESTAMP(3) NOT NULL,
+
+    CONSTRAINT "system_configs_pkey" PRIMARY KEY ("key")
+);
+
+-- AlterTable: orders - add subscription fields
+ALTER TABLE "orders" ADD COLUMN "order_type" TEXT NOT NULL DEFAULT 'balance';
+ALTER TABLE "orders" ADD COLUMN "plan_id" TEXT;
+ALTER TABLE "orders" ADD COLUMN "subscription_group_id" INTEGER;
+ALTER TABLE "orders" ADD COLUMN "subscription_days" INTEGER;
+
+-- CreateIndex
+CREATE UNIQUE INDEX "channels_group_id_key" ON "channels"("group_id");
+CREATE INDEX "channels_sort_order_idx" ON "channels"("sort_order");
+
+CREATE UNIQUE INDEX "subscription_plans_group_id_key" ON "subscription_plans"("group_id");
+CREATE INDEX "subscription_plans_for_sale_sort_order_idx" ON "subscription_plans"("for_sale", "sort_order");
+
+CREATE INDEX "system_configs_group_idx" ON "system_configs"("group");
+
+CREATE INDEX "orders_order_type_idx" ON "orders"("order_type");
+
+-- AddForeignKey
+ALTER TABLE "orders" ADD CONSTRAINT "orders_plan_id_fkey" FOREIGN KEY ("plan_id") REFERENCES "subscription_plans"("id") ON DELETE SET NULL ON UPDATE CASCADE;

prisma/schema.prisma

@@ -40,6 +40,13 @@ model Order {
   srcHost       String?     @map("src_host")
   srcUrl        String?     @map("src_url")
 
+  // ── 订单类型 & 订阅相关 ──
+  orderType           String             @default("balance") @map("order_type")
+  planId              String?            @map("plan_id")
+  plan                SubscriptionPlan?  @relation(fields: [planId], references: [id])
+  subscriptionGroupId Int?               @map("subscription_group_id")
+  subscriptionDays    Int?               @map("subscription_days")
+
   auditLogs     AuditLog[]
 
   @@index([userId])
@@ -48,6 +55,7 @@ model Order {
   @@index([createdAt])
   @@index([paidAt])
   @@index([paymentType, paidAt])
+  @@index([orderType])
   @@map("orders")
 }
 
@@ -77,3 +85,55 @@ model AuditLog {
   @@index([createdAt])
   @@map("audit_logs")
 }
+
+// ── 渠道展示配置 ──
+model Channel {
+  id             String   @id @default(cuid())
+  groupId        Int      @unique @map("group_id")
+  name           String
+  platform       String   @default("claude")
+  rateMultiplier Decimal  @db.Decimal(10, 4) @map("rate_multiplier")
+  description    String?  @db.Text
+  models         String?  @db.Text
+  features       String?  @db.Text
+  sortOrder      Int      @default(0) @map("sort_order")
+  enabled        Boolean  @default(true)
+  createdAt      DateTime @default(now()) @map("created_at")
+  updatedAt      DateTime @updatedAt @map("updated_at")
+
+  @@index([sortOrder])
+  @@map("channels")
+}
+
+// ── 订阅套餐配置 ──
+model SubscriptionPlan {
+  id            String   @id @default(cuid())
+  groupId       Int      @unique @map("group_id")
+  name          String
+  description   String?  @db.Text
+  price         Decimal  @db.Decimal(10, 2)
+  originalPrice Decimal? @db.Decimal(10, 2) @map("original_price")
+  validityDays  Int      @default(30) @map("validity_days")
+  features      String?  @db.Text
+  forSale       Boolean  @default(false) @map("for_sale")
+  sortOrder     Int      @default(0) @map("sort_order")
+  createdAt     DateTime @default(now()) @map("created_at")
+  updatedAt     DateTime @updatedAt @map("updated_at")
+
+  orders        Order[]
+
+  @@index([forSale, sortOrder])
+  @@map("subscription_plans")
+}
+
+// ── 系统配置 ──
+model SystemConfig {
+  key       String   @id
+  value     String   @db.Text
+  group     String   @default("general")
+  label     String?
+  updatedAt DateTime @updatedAt @map("updated_at")
+
+  @@index([group])
+  @@map("system_configs")
+}