Wire up real implementations for Tracking & Config controllers

- TrackingController: Added database persistence for analytics events
  * Created AnalyticsEvent entity with user/session tracking
  * Store event type, data (JSON), and timestamp
  * Graceful fallback if DB write fails (game doesn't break)

- ConfigController: Added real player counting
  * Query active sessions from last 15 minutes
  * Return actual player count instead of hardcoded 0
  * Real-time server status with DB metrics

- Added AnalyticsEvents table migration
  * Stores all game telemetry for analytics
  * Indexed by UserId for performance
  * JSON event data for flexibility

Controllers now fully wired to database:
- 11/18 controllers REAL implementation ✅
- 5/18 controllers STUB (config-based) ⚠️
- 2/18 controllers SERVICE (delegated) ⚠️

Total: 95 endpoints, improving from demo to production

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

RR3CommunityServer/Data/RR3DbContext.cs

@@ -41,6 +41,7 @@ public class RR3DbContext : DbContext
     public DbSet<RaceParticipant> RaceParticipants { get; set; }
     public DbSet<GhostData> GhostData { get; set; }
     public DbSet<CompetitiveRating> CompetitiveRatings { get; set; }
+    public DbSet<AnalyticsEvent> AnalyticsEvents { get; set; }
 
     protected override void OnModelCreating(ModelBuilder modelBuilder)
     {
@@ -736,3 +737,17 @@ public class CompetitiveRating
     // Navigation properties
     public User? User { get; set; }
 }
+
+// Analytics/tracking events
+public class AnalyticsEvent
+{
+    public int Id { get; set; }
+    public string EventType { get; set; } = string.Empty;
+    public int? UserId { get; set; }
+    public string? SessionId { get; set; }
+    public string EventData { get; set; } = string.Empty; // JSON data
+    public DateTime Timestamp { get; set; } = DateTime.UtcNow;
+    
+    // Navigation property
+    public User? User { get; set; }
+}