chore: init saasshop repo + sql migrations runner + gitee go

app/Http/Controllers/Concerns/ResolvesSiteContext.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace App\Http\Controllers\Concerns;
+
+use App\Models\Admin;
+use App\Models\Merchant;
+use Illuminate\Http\Request;
+
+trait ResolvesSiteContext
+{
+    protected function siteId(Request $request): int
+    {
+        return (int) ($request->session()->get('admin_site_id') ?: $request->session()->get('admin_merchant_id'));
+    }
+
+    protected function site(Request $request): Merchant
+    {
+        return Merchant::query()->findOrFail($this->siteId($request));
+    }
+
+    protected function siteAdmin(Request $request): Admin
+    {
+        return Admin::query()->findOrFail((int) $request->session()->get('admin_id'));
+    }
+}