feat: 添加新的错误码以支持投注功能，更新数据库填充器以增强玩法和赔率配置，扩展 API 路由以支持风险池管理

app/Http/Controllers/Api/V1/Admin/Risk/AdminRiskPoolIndexController.php

@@ -0,0 +1,74 @@
+<?php
+
+namespace App\Http\Controllers\Api\V1\Admin\Risk;
+
+use App\Http\Controllers\Controller;
+use App\Models\Draw;
+use App\Models\RiskPool;
+use App\Support\ApiResponse;
+use Illuminate\Contracts\Pagination\LengthAwarePaginator;
+use Illuminate\Http\JsonResponse;
+use Illuminate\Http\Request;
+
+/**
+ * GET /api/v1/admin/draws/{draw}/risk-pools — 按期号分页查询赔付池事实（售罄筛选、排序）。
+ *
+ * 对齐产品文档：后台查看售罄与风险占用、热门号码监控（按占用排序）。
+ */
+final class AdminRiskPoolIndexController extends Controller
+{
+    public function __invoke(Request $request, Draw $draw): JsonResponse
+    {
+        $perPage = min(max((int) $request->integer('per_page', 25), 1), 100);
+        $soldOutOnly = $request->boolean('sold_out_only');
+        $sort = trim((string) $request->query('sort', 'usage_desc'));
+
+        $q = RiskPool::query()->where('draw_id', $draw->id);
+
+        if ($soldOutOnly) {
+            $q->where('sold_out_status', 1);
+        }
+
+        match ($sort) {
+            'locked_desc' => $q->orderByDesc('locked_amount')->orderBy('normalized_number'),
+            'remaining_asc' => $q->orderBy('remaining_amount')->orderBy('normalized_number'),
+            'number_asc' => $q->orderBy('normalized_number'),
+            default => $q->orderByRaw('(locked_amount * 1.0 / NULLIF(total_cap_amount, 0)) DESC')
+                ->orderByDesc('locked_amount')
+                ->orderBy('normalized_number'),
+        };
+
+        /** @var LengthAwarePaginator $paginator */
+        $paginator = $q->paginate($perPage);
+
+        return ApiResponse::success([
+            'draw_id' => (int) $draw->id,
+            'draw_no' => $draw->draw_no,
+            'items' => collect($paginator->items())->map(fn (RiskPool $row) => $this->row($row))->all(),
+            'meta' => [
+                'current_page' => $paginator->currentPage(),
+                'per_page' => $paginator->perPage(),
+                'total' => $paginator->total(),
+                'last_page' => $paginator->lastPage(),
+            ],
+        ]);
+    }
+
+    /** @return array<string, mixed> */
+    private function row(RiskPool $pool): array
+    {
+        $cap = (int) $pool->total_cap_amount;
+        $locked = (int) $pool->locked_amount;
+
+        return [
+            'normalized_number' => $pool->normalized_number,
+            'total_cap_amount' => $cap,
+            'locked_amount' => $locked,
+            'remaining_amount' => (int) $pool->remaining_amount,
+            'sold_out_status' => (int) $pool->sold_out_status,
+            'is_sold_out' => (int) $pool->sold_out_status === 1,
+            'usage_ratio' => $cap > 0 ? round($locked / $cap, 6) : null,
+            'version' => (int) $pool->version,
+        ];
+    }
+}