Add NoOpTelemetryService and conditional registration logic

Co-authored-by: JFenderson <24466206+JFenderson@users.noreply.github.com>

Author: Copilot

Backend/Podium/Podium.API/Extensions/MonitoringExtensions.cs

@@ -48,11 +48,27 @@ public static IServiceCollection AddPodiumApplicationInsights(this IServiceColle
 
     /// <summary>
     /// Adds custom telemetry tracking services.
+    /// Conditionally registers real or no-op implementations based on Application Insights configuration.
     /// </summary>
-    public static IServiceCollection AddPodiumTelemetryServices(this IServiceCollection services)
+    public static IServiceCollection AddPodiumTelemetryServices(this IServiceCollection services, IConfiguration configuration)
     {
-        services.AddScoped<ITelemetryService, TelemetryService>();
-        services.AddScoped<MetricsService>();
+        var connectionString = configuration["APPLICATIONINSIGHTS_CONNECTION_STRING"] 
+            ?? configuration["ApplicationInsights:ConnectionString"];
+        var isEnabled = configuration.GetValue<bool>("ENABLE_APPLICATION_INSIGHTS", true);
+
+        if (!string.IsNullOrWhiteSpace(connectionString) && isEnabled)
+        {
+            // Application Insights is enabled - register real implementations
+            services.AddScoped<ITelemetryService, TelemetryService>();
+            services.AddScoped<MetricsService>();
+            Console.WriteLine("Telemetry services registered (Application Insights enabled)");
+        }
+        else
+        {
+            // Application Insights is disabled - register no-op implementation
+            services.AddScoped<ITelemetryService, NoOpTelemetryService>();
+            Console.WriteLine("No-op telemetry service registered (Application Insights disabled)");
+        }
 
         return services;
     }

Backend/Podium/Podium.API/Program.cs

@@ -78,7 +78,7 @@
     // MONITORING: Application Insights, Health Checks, Telemetry
     // ---------------------------------------------------------
     builder.Services.AddPodiumApplicationInsights(builder.Configuration);
-    builder.Services.AddPodiumTelemetryServices();
+    builder.Services.AddPodiumTelemetryServices(builder.Configuration);
     builder.Services.AddPodiumHealthChecks(builder.Configuration);
     // ---------------------------------------------------------
 

Backend/Podium/Podium.Infrastructure/Telemetry/NoOpTelemetryService.cs

@@ -0,0 +1,48 @@
+using Microsoft.Extensions.Logging;
+using Podium.Core.Interfaces;
+
+namespace Podium.Infrastructure.Telemetry;
+
+/// <summary>
+/// No-op implementation of telemetry service used when Application Insights is disabled.
+/// All methods log at debug level and perform no actual telemetry tracking.
+/// </summary>
+public class NoOpTelemetryService : ITelemetryService
+{
+    private readonly ILogger<NoOpTelemetryService> _logger;
+
+    public NoOpTelemetryService(ILogger<NoOpTelemetryService> logger)
+    {
+        _logger = logger;
+    }
+
+    /// <inheritdoc/>
+    public void TrackAuthenticationAttempt(string userId, bool success, string reason)
+    {
+        _logger.LogDebug("Application Insights disabled - skipping authentication attempt telemetry for user {UserId}", userId);
+    }
+
+    /// <inheritdoc/>
+    public void TrackVideoUpload(string userId, long fileSizeBytes, TimeSpan duration, bool success)
+    {
+        _logger.LogDebug("Application Insights disabled - skipping video upload telemetry for user {UserId}", userId);
+    }
+
+    /// <inheritdoc/>
+    public void TrackDatabaseQuery(string queryName, TimeSpan duration)
+    {
+        _logger.LogDebug("Application Insights disabled - skipping database query telemetry for {QueryName}", queryName);
+    }
+
+    /// <inheritdoc/>
+    public void TrackApiEndpoint(string endpoint, TimeSpan responseTime, int statusCode)
+    {
+        _logger.LogDebug("Application Insights disabled - skipping API endpoint telemetry for {Endpoint}", endpoint);
+    }
+
+    /// <inheritdoc/>
+    public void TrackException(Exception ex, Dictionary<string, string> properties)
+    {
+        _logger.LogDebug("Application Insights disabled - skipping exception telemetry for {ExceptionType}", ex.GetType().Name);
+    }
+}