feat: Real-time Outbound Traffic, UI Improvements & Fix (#3629)

* Refactor HTML and JavaScript for improved UI and functionality

- Cleaned up JavaScript methods in subscription.js for better readability.
- Updated inbounds.html to clarify traffic update handling and removed unnecessary comments.
- Enhanced xray.html by correcting casing in routingDomainStrategies.
- Added mobile touch scrolling styles in page.html for better tab navigation on small screens.
- Streamlined vless.html by removing redundant line breaks and improving form layout.
- Refined subscription subpage.html for better structure and user experience.
- Adjusted outbounds.html to improve button visibility and functionality.
- Updated xray_traffic_job.go to ensure accurate traffic updates and real-time UI refresh.

* Refactor client traffic handling in InboundService

- Updated addClientTraffic method to initialize onlineClients as an empty slice instead of nil.
- Improved clarity and consistency in handling empty onlineUsers scenario.

* Add WebSocket support for outbounds traffic updates

- Implemented WebSocket connection in xray.html to handle real-time updates for outbounds traffic.
- Enhanced xray_traffic_job.go to retrieve and broadcast outbounds traffic updates.
- Introduced MessageTypeOutbounds in hub.go for managing outbounds messages.
- Added BroadcastOutbounds function in notifier.go to facilitate broadcasting outbounds updates to connected clients.

---------

Co-authored-by: lolka1333 <test123@gmail.com>

web/html/settings/xray/outbounds.html

@@ -3,8 +3,8 @@
     <a-row>
         <a-col :xs="12" :sm="12" :lg="12">
             <a-space direction="horizontal" size="small">
-                <a-button type="primary" icon="plus" @click="addOutbound()">
-                    {{ i18n "pages.xray.outbound.addOutbound" }}
+                <a-button type="primary" icon="plus" @click="addOutbound">
+                    <span v-if="!isMobile">{{ i18n "pages.xray.outbound.addOutbound" }}</span>
                 </a-button>
                 <a-button type="primary" icon="cloud" @click="showWarp()">WARP</a-button>
             </a-space>