feat：增加数据库迁移文件

database/migrations/2026_05_08_100007_create_draws_table.php

@@ -0,0 +1,35 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::create('draws', function (Blueprint $table) {
+            $table->id();
+            $table->string('draw_no', 32)->unique();
+            $table->date('business_date');
+            $table->unsignedInteger('sequence_no');
+            $table->string('status', 32);
+            $table->timestamp('start_time')->nullable();
+            $table->timestamp('close_time')->nullable();
+            $table->timestamp('draw_time')->nullable();
+            $table->timestamp('cooling_end_time')->nullable();
+            $table->string('result_source', 16)->nullable()->comment('rng|manual');
+            $table->unsignedInteger('current_result_version')->default(0);
+            $table->unsignedInteger('settle_version')->default(0);
+            $table->boolean('is_reopened')->default(false);
+            $table->timestamps();
+
+            $table->index(['status', 'draw_time'], 'idx_draws_status_draw_time');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('draws');
+    }
+};