[PERF] Excessive Disk I/O Inside Monitor Loop

[arumes31]

This PR addresses the excessive disk I/O in the monitor loop by implementing in-memory caching for configuration and status data in the internal/config package.

Key changes:

• Introduced cachedConfig and cachedStatus global variables in internal/config.
• Implemented a thread-safe deepCopy mechanism to ensure callers receive isolated copies of data.
• Refactored LoadConfig, SaveConfig, UpdateConfig, LoadStatus, SaveStatus, and UpdateStatus to leverage the cache and minimize disk access.
• Added a clearCache() function for test isolation.
• Added a safety check in internal/monitor/monitor.go to prevent panics from invalid ticker intervals.
• Verified performance gains with a dedicated cache test.

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PR created automatically by Jules for task 5334846195362309024 started by @arumes31

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