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* feat(cache): Add intelligent disk cache cleanup with retention policies - Add cleanup_expired_files() method to DiskCache class - Implement retention policies based on cache data types: * Odds data: 2 days (lines move frequently) * Live/recent/leaderboard: 7 days (weekly updates) * News/stocks: 14 days * Upcoming/schedules/team_info/logos: 60 days (stable data) - Add cleanup_disk_cache() orchestration in CacheManager - Start background cleanup thread running every 24 hours - Run cleanup on application startup - Add disk cleanup metrics tracking - Comprehensive logging with cleanup statistics This prevents disk cache from accumulating indefinitely while preserving important season data longer than volatile live game data. * refactor(cache): improve disk cache cleanup implementation - Implement force parameter throttle mechanism in cleanup_disk_cache - Fix TOCTOU race condition in disk cache cleanup (getsize/remove) - Reduce lock contention by processing files outside lock where possible - Add CacheStrategyProtocol for better type safety (replaces Any) - Move time import to module level in cache_metrics - Defer initial cleanup to background thread for non-blocking startup - Add graceful shutdown mechanism with threading.Event for cleanup thread - Add stop_cleanup_thread() method for controlled thread termination * fix(cache): improve disk cache cleanup initialization and error handling - Only start cleanup thread when disk caching is enabled (cache_dir is set) - Remove unused retention policy keys (leaderboard, live_scores, logos) - Handle FileNotFoundError as benign race condition in cleanup - Preserve existing OSError handling for actual file system errors --------- Co-authored-by: Chuck <chuck@example.com>