feat(Backend): update API gateway and websocket hubs

FinlyticBackend/Controllers/DashboardController.cs

@@ -0,0 +1,29 @@
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using System.Threading.Tasks;
+
+namespace FinlyticBackend.Controllers;
+
+[ApiController]
+[Route("api/v1/[controller]")]
+[Authorize(Roles = "Admin")]
+public class DashboardController : ControllerBase
+{
+    /// <summary>
+    /// Retrieves global statistics aggregated from all microservices.
+    /// Currently returns mocked data for UI development.
+    /// </summary>
+    [HttpGet("stats")]
+    public IActionResult GetGlobalStats()
+    {
+        return Ok(new
+        {
+            totalAssetsLoaded = 12450,
+            totalNewsArticles = 8340,
+            activeTrades = 12,
+            systemUptimeHours = 342,
+            sentimentAnalysesCompleted = 45000,
+            technicalAnalysesCompleted = 120000
+        });
+    }
+}