feat(platform): 新增对外平台入口 /platform（首页+套餐展示）

app/Http/Controllers/Front/PlatformController.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace App\Http\Controllers\Front;
+
+use App\Http\Controllers\Controller;
+use App\Models\Plan;
+use Illuminate\Http\Request;
+use Illuminate\View\View;
+
+class PlatformController extends Controller
+{
+    public function index(Request $request): View
+    {
+        return view('platform.index');
+    }
+
+    public function plans(Request $request): View
+    {
+        // 对外展示口径：仅展示“已发布 + 启用中”的套餐，避免未准备好的套餐被外部看到。
+        $plans = Plan::query()
+            ->where('status', 'active')
+            ->whereNotNull('published_at')
+            ->orderBy('sort')
+            ->orderByDesc('id')
+            ->get();
+
+        return view('platform.plans', [
+            'plans' => $plans,
+        ]);
+    }
+}