Split CompanyController and introduce standalone User Settings page

Backend:
- Extract user profile methods (show, update, uploadAvatar) from
  CompanyController into new UserProfileController
- CompanyController now only handles company concerns (updateCompany,
  uploadCompanyLogo)
- Remove Account Settings from setting_menu config

Frontend:
- New /admin/user-settings page with 3 tabs: General, Profile Photo,
  Security (password change)
- User dropdown now links to /admin/user-settings instead of
  /admin/settings/account-settings
- Settings sidebar defaults to Company Information as first item
- Remove old monolithic AccountSetting.vue

tests/Feature/Admin/CompanySettingTest.php

@@ -1,6 +1,7 @@
 <?php
 
 use App\Http\Controllers\V1\Admin\Settings\CompanyController;
+use App\Http\Controllers\V1\Admin\Settings\UserProfileController;
 use App\Http\Requests\CompanyRequest;
 use App\Http\Requests\ProfileRequest;
 use App\Models\Invoice;
@@ -35,8 +36,8 @@ test('get profile', function () {
 
 test('update profile using a form request', function () {
     $this->assertActionUsesFormRequest(
-        CompanyController::class,
-        'updateProfile',
+        UserProfileController::class,
+        'update',
         ProfileRequest::class
     );
 });