feat(auth): 회원가입 시 휴대폰·전화번호 선택 입력 추가

마이페이지·관리자 회원 폼에는 이미 연락처 필드가 있으나 회원가입 폼에만
빠져 두 화면이 불일치했다. DB·모델·Resource는 기존 존재하므로 회원가입
경로에만 검증·저장·입력 UI를 연결한다. 연락처는 선택 항목이다.

app/Http/Requests/Auth/RegisterRequest.php

@@ -4,6 +4,7 @@ namespace App\Http\Requests\Auth;
 
 use App\Extension\HookManager;
 use App\Models\User;
+use Illuminate\Contracts\Validation\ValidationRule;
 use Illuminate\Foundation\Http\FormRequest;
 use Illuminate\Validation\Rule;
 
@@ -11,6 +12,8 @@ class RegisterRequest extends FormRequest
 {
     /**
      * Determine if the user is authorized to make this request.
+     *
+     * @return bool 항상 true (권한은 미들웨어 체인에서 처리)
      */
     public function authorize(): bool
     {
@@ -20,7 +23,7 @@ class RegisterRequest extends FormRequest
     /**
      * Get the validation rules that apply to the request.
      *
-     * @return array<string, \Illuminate\Contracts\Validation\ValidationRule|array<mixed>|string>
+     * @return array<string, ValidationRule|array<mixed>|string>
      */
     public function rules(): array
     {
@@ -29,7 +32,9 @@ class RegisterRequest extends FormRequest
             'nickname' => 'nullable|string|max:50',
             'email' => ['required', 'string', 'email', 'max:255', Rule::unique(User::class)],
             'password' => 'required|string|min:8|confirmed',
-            'language' => 'nullable|string|in:' . implode(',', config('app.supported_locales', ['ko', 'en'])),
+            'mobile' => ['nullable', 'string', 'max:20', 'regex:/^[0-9\-\+\(\)\s]+$/'],
+            'phone' => ['nullable', 'string', 'max:20', 'regex:/^[0-9\-\+\(\)\s]+$/'],
+            'language' => 'nullable|string|in:'.implode(',', config('app.supported_locales', ['ko', 'en'])),
             'agree_terms' => 'accepted',
             'agree_privacy' => 'accepted',
         ];
@@ -55,6 +60,10 @@ class RegisterRequest extends FormRequest
             'password.required' => __('validation.auth.password.required'),
             'password.min' => __('validation.auth.password.min'),
             'password.confirmed' => __('validation.auth.password.confirmed'),
+            'mobile.max' => __('validation.auth.mobile.max'),
+            'mobile.regex' => __('validation.auth.mobile.regex'),
+            'phone.max' => __('validation.auth.phone.max'),
+            'phone.regex' => __('validation.auth.phone.regex'),
             'agree_terms.accepted' => __('validation.auth.agree_terms.accepted'),
             'agree_privacy.accepted' => __('validation.auth.agree_privacy.accepted'),
         ];