Implement player session management

Objective

Create robust player session management system that handles authentication state, session persistence, and player lifecycle management.

Requirements

• Session Tracking: Track authenticated players across connections ✅
• State Persistence: Maintain player state during reconnections ✅
• Session Security: Validate and refresh authentication tokens ✅
• Cleanup: Handle disconnection and session expiration gracefully ✅

Technical Details

• Integrate with Keycloak authentication system ✅
• Create session storage and retrieval mechanisms ✅
• Implement session timeout and cleanup policies ✅
• Handle WebSocket connection mapping to player sessions ✅
• Add session state synchronization ✅
• Implement graceful session migration on reconnect ✅

Acceptance Criteria

• Player sessions are created on successful authentication
• Sessions persist across WebSocket reconnections
• Session expiration is handled properly
• Player state is maintained during brief disconnections
• Session cleanup prevents memory leaks

Implementation Status - COMPLETED ✅

Recent Updates (2025-07-02):

• ✅ Session Creation: Automatic session creation on WebSocket authentication
• ✅ Token Integration: JWT token validation with Keycloak integration
• ✅ Session Persistence: localStorage-based token persistence with 7-day expiration
• ✅ Connection Mapping: WebSocket connections properly mapped to user sessions
• ✅ Reconnection Handling: Seamless session restoration on reconnection
• ✅ Session Cleanup: Automatic cleanup on disconnection and timeout
• ✅ State Management: Player state maintained across connection drops

Technical Implementation:

• SessionManager.ts: Server-side session tracking and lifecycle management
• AuthController.ts: Authentication endpoint with session creation
• AuthManager.ts: Client-side token persistence and auto-login
• ConnectionManager.ts: Session restoration on reconnection
• ProtobufWebSocketHandler.ts: Session validation and connection mapping

Session Flow:

1. User authenticates via Keycloak → Session created
2. WebSocket connects → Session validated via JWT token
3. Connection drops → Session maintained server-side
4. Reconnection → Session restored automatically
5. Session expiry/logout → Cleanup and disconnection

Milestone Relation

✅ COMPLETED - Critical for MVP multiplayer functionality. Bridges authentication with game state management and enables persistent player experiences.