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

lang/en.json

@@ -1133,12 +1133,14 @@
       }
     },
     "account_settings": {
-      "profile_picture": "Profile Picture",
+      "profile_picture": "Profile Photo",
       "name": "Name",
       "email": "Email",
       "password": "Password",
       "confirm_password": "Confirm Password",
-      "account_settings": "Account Settings",
+      "account_settings": "User Settings",
+      "general": "General",
+      "security": "Security",
       "save": "Save",
       "section_description": "You can update your name, email & password using the form below.",
       "updated_message": "Account Settings updated successfully"