Implement telemetry system with data collection and reporting

Signed-off-by: Dmitrii <computer@yawaflua.tech>

Took 20 minutes

backend/SpMega.Backend/Persistent/Models/Telemetry/BackendRequestTelemetryDocument.cs

@@ -0,0 +1,19 @@
+using MongoDB.Bson;
+
+namespace SpMega.Backend.Persistent.Models.Telemetry;
+
+public class BackendRequestTelemetryDocument
+{
+    public ObjectId Id { get; set; }
+    public string RequestId { get; set; } = string.Empty;
+    public string Method { get; set; } = string.Empty;
+    public string Path { get; set; } = string.Empty;
+    public string Scheme { get; set; } = string.Empty;
+    public string Host { get; set; } = string.Empty;
+    public string? ClientIp { get; set; }
+    public string? UserAgent { get; set; }
+    public int StatusCode { get; set; }
+    public long DurationMs { get; set; }
+    public string? UserId { get; set; }
+    public DateTimeOffset Timestamp { get; set; } = DateTimeOffset.UtcNow;
+}

backend/SpMega.Backend/Persistent/Models/Telemetry/ModTelemetryDocument.cs

@@ -0,0 +1,21 @@
+using MongoDB.Bson;
+
+namespace SpMega.Backend.Persistent.Models.Telemetry;
+
+public class ModTelemetryDocument
+{
+    public ObjectId Id { get; set; }
+    public string UserId { get; set; } = string.Empty;
+    public string SessionId { get; set; } = string.Empty;
+    public string ClientVersion { get; set; } = string.Empty;
+    public DateTimeOffset SentAt { get; set; }
+    public DateTimeOffset ReceivedAt { get; set; } = DateTimeOffset.UtcNow;
+    public List<ModTelemetryEventDocument> Events { get; set; } = [];
+}
+
+public class ModTelemetryEventDocument
+{
+    public string EventType { get; set; } = string.Empty;
+    public DateTimeOffset Timestamp { get; set; }
+    public string PayloadJson { get; set; } = "{}";
+}