fix(i18n): 使用者密碼驗證訊息中文化

- 新增/編輯使用者時，密碼欄位的驗證錯誤訊息改為繁體中文顯示

app/Http/Controllers/Admin/UserController.php

@@ -61,6 +61,10 @@ class UserController extends Controller
             'username' => ['required', 'string', 'max:255', 'unique:users'],
             'password' => ['required', 'string', 'min:8', 'confirmed'],
             'roles' => ['array'], 
+        ], [
+            'password.required' => '請輸入密碼',
+            'password.min' => '密碼長度至少需 :min 個字元',
+            'password.confirmed' => '密碼確認不符',
         ]);
 
         $user = User::create([
@@ -105,6 +109,9 @@ class UserController extends Controller
             'username' => ['required', 'string', 'max:255', Rule::unique('users')->ignore($user->id)],
             'password' => ['nullable', 'string', 'min:8', 'confirmed'],
             'roles' => ['array'],
+        ], [
+            'password.min' => '密碼長度至少需 :min 個字元',
+            'password.confirmed' => '密碼確認不符',
         ]);
 
         $userData = [