Add Events Service - Career mode unlocked! (96% complete)

EVENTS SERVICE (4/4 endpoints - 100%):
- GET  /synergy/events/active - List active events with player progress
- GET  /synergy/events/{eventId} - Event details and requirements
- POST /synergy/events/{eventId}/start - Start event attempt
- POST /synergy/events/{eventId}/complete - Submit results, award rewards

Features:
- Track player progression through career events
- Personal best detection with improvement bonuses
- Reduced rewards on replays (prevents farming)
- Full integration with user/session system

Database:
- Events table (16 columns) with series/event organization
- EventCompletions table for player progress tracking
- EventAttempts table for session management
- Migration AddEventsSystem applied successfully

Documentation:
- AUTHENTICATION-ANALYSIS.md - Proof .NET implementation is correct
- BINARY-PATCH-ANALYSIS.md - ARM64 patch analysis

Server progress: 70/73 endpoints (96%)
Career mode now fully functional!

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

RR3CommunityServer/Data/RR3DbContext.cs

@@ -27,6 +27,9 @@ public class RR3DbContext : DbContext
     public DbSet<PlayerSave> PlayerSaves { get; set; }
     public DbSet<LeaderboardEntry> LeaderboardEntries { get; set; }
     public DbSet<PersonalRecord> PersonalRecords { get; set; }
+    public DbSet<Event> Events { get; set; }
+    public DbSet<EventCompletion> EventCompletions { get; set; }
+    public DbSet<EventAttempt> EventAttempts { get; set; }
 
     protected override void OnModelCreating(ModelBuilder modelBuilder)
     {
@@ -478,3 +481,56 @@ public class ModPack
     public DateTime CreatedAt { get; set; }
     public DateTime? UpdatedAt { get; set; }
 }
+
+// Career Events entity
+public class Event
+{
+    public int Id { get; set; }
+    public string EventCode { get; set; } = string.Empty;
+    public string Name { get; set; } = string.Empty;
+    public string SeriesName { get; set; } = string.Empty;
+    public int SeriesOrder { get; set; }
+    public int EventOrder { get; set; }
+    public string Track { get; set; } = string.Empty;
+    public string EventType { get; set; } = "race"; // race, duel, elimination, etc
+    public int Laps { get; set; }
+    public int RequiredPR { get; set; }
+    public string? RequiredCarClass { get; set; }
+    public double? TargetTime { get; set; }
+    public int GoldReward { get; set; }
+    public int CashReward { get; set; }
+    public int XPReward { get; set; }
+    public bool Active { get; set; } = true;
+}
+
+// Tracks player's completion of events
+public class EventCompletion
+{
+    public int Id { get; set; }
+    public int UserId { get; set; }
+    public int EventId { get; set; }
+    public double BestTime { get; set; }
+    public int CompletionCount { get; set; }
+    public DateTime FirstCompletedAt { get; set; }
+    public DateTime LastCompletedAt { get; set; }
+    
+    // Navigation properties
+    public User? User { get; set; }
+    public Event? Event { get; set; }
+}
+
+// Tracks active event attempts
+public class EventAttempt
+{
+    public int Id { get; set; }
+    public int UserId { get; set; }
+    public int EventId { get; set; }
+    public DateTime StartedAt { get; set; }
+    public bool Completed { get; set; }
+    public DateTime? CompletedAt { get; set; }
+    public double? TimeSeconds { get; set; }
+    
+    // Navigation properties
+    public User? User { get; set; }
+    public Event? Event { get; set; }
+}