feat(admin): 客服中心工单骨架（模型/迁移/路由/菜单/页面）

database/migrations/2026_03_15_083356_create_support_tickets_table.php

@@ -0,0 +1,59 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('support_tickets', function (Blueprint $table) {
+            $table->id();
+
+            // scope：用于多层级隔离（platform/site/merchant）
+            $table->string('scope', 20)->default('platform');
+            $table->unsignedBigInteger('scope_id')->nullable();
+
+            // 关联对象（用于“收费闭环/治理串联”）
+            $table->unsignedBigInteger('merchant_id')->nullable();
+            $table->unsignedBigInteger('buyer_id')->nullable();
+            $table->unsignedBigInteger('order_id')->nullable();
+            $table->unsignedBigInteger('platform_order_id')->nullable();
+            $table->unsignedBigInteger('site_subscription_id')->nullable();
+            $table->unsignedBigInteger('platform_lead_id')->nullable();
+
+            // 工单基础字段
+            $table->string('ticket_no', 50)->unique();
+            $table->string('category', 50)->default('general');
+            $table->string('priority', 20)->default('normal');
+            $table->string('status', 20)->default('open');
+            $table->string('subject', 200)->default('');
+            $table->text('content')->nullable();
+
+            // 指派与时间
+            $table->unsignedBigInteger('assigned_admin_id')->nullable();
+            $table->timestamp('closed_at')->nullable();
+
+            $table->timestamps();
+
+            $table->index(['scope', 'scope_id']);
+            $table->index(['merchant_id']);
+            $table->index(['platform_order_id']);
+            $table->index(['site_subscription_id']);
+            $table->index(['platform_lead_id']);
+            $table->index(['status', 'priority']);
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('support_tickets');
+    }
+};