fix: add lifecycle cleanup hooks and error handling for async operations

[Flegma]

Summary

• Add OnApplicationShutdown to RedisManagerService to clear health check intervals and disconnect Redis on shutdown
• Cap recursive setTimeout retries in MatchAssistantService.assignServer to 10 attempts
• Replace void fire-and-forget patterns with .catch() error handlers in AppModule, SocketsService, and MatchesModule

Closes 5stackgg/5stack-panel#375, 5stackgg/5stack-panel#376

Test plan

• Verify Redis health check intervals are cleared on app shutdown
• Verify assignServer stops retrying after 10 attempts
• Verify async errors are logged instead of silently dropped