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

app/Http/Controllers/MerchantAdmin/DashboardController.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace App\Http\Controllers\MerchantAdmin;
+
+use App\Http\Controllers\Concerns\ResolvesMerchantContext;
+use App\Http\Controllers\Controller;
+use App\Models\Order;
+use App\Models\Product;
+use App\Models\User;
+use App\Support\CacheKeys;
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Cache;
+use Illuminate\View\View;
+
+class DashboardController extends Controller
+{
+    use ResolvesMerchantContext;
+
+    public function index(Request $request): View
+    {
+        $merchantId = $this->merchantId($request);
+        $merchant = $this->merchant($request);
+
+        $stats = Cache::remember(
+            CacheKeys::merchantDashboardStats($merchantId),
+            now()->addMinutes(10),
+            fn () => [
+                'users' => User::query()->forMerchant($merchantId)->count(),
+                'products' => Product::query()->forMerchant($merchantId)->count(),
+                'orders' => Order::query()->forMerchant($merchantId)->count(),
+                'pending_orders' => Order::query()->forMerchant($merchantId)->where('status', 'pending')->count(),
+            ]
+        );
+
+        return view('merchant_admin.dashboard', [
+            'merchant' => $merchant,
+            'stats' => $stats,
+            'cacheMeta' => [
+                'store' => config('cache.default'),
+                'ttl' => '10m',
+            ],
+        ]);
+    }
+}