增加管理员相关控制器及基础页面视图

*内容后续建设

controllers/AdminController.php

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+<?php
+
+namespace app\controllers;
+
+use Yii;
+use yii\filters\AccessControl;
+use yii\filters\VerbFilter;
+use yii\web\Controller;
+
+class AdminController extends Controller
+{
+    /**
+     * @inheritDoc
+     */
+    public function behaviors(): array
+    {
+        return array_merge(
+            parent::behaviors(),
+            [
+                'access' => [
+                    'class' => AccessControl::class,
+                    'rules' => [
+                        [
+                            'allow' => true,
+                            'actions' => ['index', 'system', 'user', 'info'],
+                            'roles' => ['admin'], // only admin can do these
+                        ]
+                    ],
+                ],
+                'verbs' => [
+                    'class' => VerbFilter::class,
+                    'actions' => [
+                        'index' => ['GET'],
+                        'system' => ['GET'],
+                        'user' => ['GET'],
+                        'info' => ['GET'],
+                    ],
+                ],
+            ]
+        );
+    }
+
+    public function init(): void
+    {
+        parent::init();
+        $this->layout = 'admin_main';
+    }
+
+    /**
+     * @return string
+     */
+    public function actionIndex(): string
+    {
+        return $this->render('index');
+    }
+
+    /**
+     * @return string
+     */
+    public function actionSystem(): string
+    {
+        return $this->render('system');
+    }
+
+    /**
+     * @return string
+     */
+    public function actionUser(): string
+    {
+        return $this->render('user');
+    }
+
+    /**
+     * @return string
+     */
+    public function actionInfo(): string
+    {
+        return $this->render('info');
+    }
+}

views/admin/index.php

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+<?php
+/** @var yii\web\View $this */
+?>
+<h1>admin/index</h1>
+
+<p>
+    这里是管理员页面.建设中
+</p>

views/admin/info.php

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+<?php
+/** @var yii\web\View $this */
+?>
+<h1>admin/index</h1>
+
+<p>
+    这里是管理员页面.建设中
+</p>

views/admin/system.php

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+<?php
+/** @var yii\web\View $this */
+?>
+<h1>admin/index</h1>
+
+<p>
+    这里是管理员页面.建设中
+</p>

views/admin/user.php

@@ -0,0 +1,8 @@
+<?php
+/** @var yii\web\View $this */
+?>
+<h1>admin/index</h1>
+
+<p>
+    这里是管理员页面.建设中
+</p>