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

config/invoiceshelf.php

@@ -130,16 +130,6 @@ return [
     * List of setting menu
     */
     'setting_menu' => [
-        [
-            'title' => 'settings.menu_title.account_settings',
-            'group' => '',
-            'name' => 'Account Settings',
-            'link' => '/admin/settings/account-settings',
-            'icon' => 'UserIcon',
-            'owner_only' => false,
-            'ability' => '',
-            'model' => '',
-        ],
         [
             'title' => 'settings.menu_title.company_information',
             'group' => '',