feat: Implement online user count from nodes

core/scripts/webpanel/routers/api/v1/config/ip.py

@@ -146,6 +146,7 @@ async def receive_node_traffic(body: NodesTrafficPayload):
                 'upload_bytes': new_upload,
                 'download_bytes': new_download,
                 'status': user_traffic.status,
+                'online_count': user_traffic.online_count,
             }
             
             if not db_user.get('account_creation_date') and user_traffic.account_creation_date:

core/scripts/webpanel/routers/api/v1/schema/config/ip.py

@@ -97,6 +97,7 @@ class NodeUserTraffic(BaseModel):
     upload_bytes: int
     download_bytes: int
     status: str
+    online_count: int
     account_creation_date: Optional[str] = None
 
     @field_validator('account_creation_date')