fix: 登录 Undefined array key（unset 后访问已删 key）；sablog 主题 footer 错位（#page 由页面视图自闭合）；PaymentSettings Section 类路径（v5 移到 Schemas）；modern 主题两栏布局

app/Blog/Controllers/AuthController.php

@@ -25,13 +25,13 @@ class AuthController extends Controller
             'password' => ['required', 'string'],
         ]);
 
-        $field = filter_var($credentials['email'], FILTER_VALIDATE_EMAIL) ? 'email' : 'name';
-        $credentials[$field] = $credentials['email'];
-        unset($credentials['email']);
+        // 支持邮箱或用户名登录
+        $login = $credentials['email'];
+        $field = filter_var($login, FILTER_VALIDATE_EMAIL) ? 'email' : 'name';
 
-        $user = User::query()->where($field, $credentials[$field])->first();
+        $user = User::query()->where($field, $login)->first();
 
-        if ($user && $user->verifyPassword($request->password)) {
+        if ($user && $user->verifyPassword($credentials['password'])) {
             Auth::login($user, $request->boolean('remember'));
             $user->forceFill([
                 'logincount' => $user->logincount + 1,