feat(Backend): update API gateway and websocket hubs

FinlyticBackend/Hubs/FavoritesPriceHub.cs

@@ -0,0 +1,31 @@
+using System;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.SignalR;
+using Microsoft.Extensions.Logging;
+
+namespace FinlyticBackend.Hubs;
+
+/// <summary>
+/// SignalR Hub streaming real-time stock prices & daily % growth updates for favorite assets every 10 seconds.
+/// </summary>
+public class FavoritesPriceHub : Hub
+{
+    private readonly ILogger<FavoritesPriceHub> _logger;
+
+    public FavoritesPriceHub(ILogger<FavoritesPriceHub> logger)
+    {
+        _logger = logger;
+    }
+
+    public override async Task OnConnectedAsync()
+    {
+        _logger.LogInformation("[FavoritesPriceHub] SignalR client connected: ConnectionId={ConnectionId}", Context.ConnectionId);
+        await base.OnConnectedAsync();
+    }
+
+    public override async Task OnDisconnectedAsync(Exception? exception)
+    {
+        _logger.LogInformation("[FavoritesPriceHub] SignalR client disconnected: ConnectionId={ConnectionId}", Context.ConnectionId);
+        await base.OnDisconnectedAsync(exception);
+    }
+}

FinlyticBackend/Hubs/NewsHub.cs

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+using Microsoft.AspNetCore.SignalR;
+using System.Threading.Tasks;
+using FinlyticCore.Dtos.News;
+
+namespace FinlyticBackend.Hubs;
+
+/// <summary>
+/// SignalR Hub for real-time news delivery to connected clients.
+/// </summary>
+public class NewsHub : Hub
+{
+    // Clients can call this to join specific symbol groups if needed later
+    public async Task SubscribeToSymbol(string symbol)
+    {
+        await Groups.AddToGroupAsync(Context.ConnectionId, symbol.ToUpperInvariant());
+    }
+
+    public async Task UnsubscribeFromSymbol(string symbol)
+    {
+        await Groups.RemoveFromGroupAsync(Context.ConnectionId, symbol.ToUpperInvariant());
+    }
+}

FinlyticBackend/Hubs/SystemHealthHub.cs

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+using System;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.SignalR;
+using Microsoft.Extensions.Logging;
+
+namespace FinlyticBackend.Hubs;
+
+/// <summary>
+/// SignalR Hub broadcasting real-time system diagnostics & microservice health updates to connected clients.
+/// </summary>
+public class SystemHealthHub : Hub
+{
+    private readonly ILogger<SystemHealthHub> _logger;
+
+    public SystemHealthHub(ILogger<SystemHealthHub> logger)
+    {
+        _logger = logger;
+    }
+
+    public override async Task OnConnectedAsync()
+    {
+        _logger.LogInformation("[SystemHealthHub] Client connected: ConnectionId={ConnectionId}", Context.ConnectionId);
+        await base.OnConnectedAsync();
+    }
+
+    public override async Task OnDisconnectedAsync(Exception? exception)
+    {
+        _logger.LogInformation("[SystemHealthHub] Client disconnected: ConnectionId={ConnectionId}", Context.ConnectionId);
+        await base.OnDisconnectedAsync(exception);
+    }
+}

FinlyticBackend/Hubs/TradeHub.cs

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+using Microsoft.AspNetCore.SignalR;
+
+namespace FinlyticBackend.Hubs;
+
+/// <summary>
+/// SignalR Hub broadcasting real-time trade signals, position updates, and closed trade events.
+/// </summary>
+public class TradeHub : Hub
+{
+    public override async Task OnConnectedAsync()
+    {
+        await base.OnConnectedAsync();
+    }
+}

FinlyticBackend/Hubs/TradeRealtimeHub.cs

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+using System;
+using System.Threading.Tasks;
+using FinlyticCore.Models.Auth;
+using Microsoft.AspNetCore.SignalR;
+using Microsoft.Extensions.Logging;
+
+namespace FinlyticBackend.Hubs;
+
+/// <summary>
+/// Real-time SignalR WebSocket & Server-Sent Events (SSE) Hub streaming live trade proposals & updates to Web and Mobile clients.
+/// </summary>
+public class TradeRealtimeHub : Hub<ITradeClient>
+{
+    private readonly ILogger<TradeRealtimeHub> _logger;
+
+    public TradeRealtimeHub(ILogger<TradeRealtimeHub> logger)
+    {
+        _logger = logger;
+    }
+
+    public override async Task OnConnectedAsync()
+    {
+        _logger.LogInformation("Real-time SignalR Client connected: ConnectionId={ConnectionId}, User={User}",
+            Context.ConnectionId, Context.User?.Identity?.Name ?? "Anonymous");
+        await base.OnConnectedAsync();
+    }
+
+    public override async Task OnDisconnectedAsync(Exception? exception)
+    {
+        _logger.LogInformation("Real-time SignalR Client disconnected: ConnectionId={ConnectionId}", Context.ConnectionId);
+        await base.OnDisconnectedAsync(exception);
+    }
+}