[PERF] Excessive Disk I/O Inside Monitor Loop

[arumes31]

This PR addresses excessive disk I/O in the service monitor loop by implementing an in-memory caching layer in the internal/config package.

Previously, the monitor loop parsed config.json from disk in every iteration to check for paused status or configuration updates. The new implementation serves these requests from a thread-safe in-memory cache, which is only invalidated and refreshed during Save or Update operations.

Key changes:

• In-memory cachedConfig and cachedStatus with sync.RWMutex protection.
• Deep copy mechanism using JSON marshaling to ensure callers cannot mutate the cache.
• Double-checked locking in LoadConfig and LoadStatus.
• Safety check in monitorService to prevent time.NewTicker panics on zero intervals.
• New unit test TestConfigCaching to verify cache persistence across disk corruption.
• Private clearCache() helper for test isolation.

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PR created automatically by Jules for task 14355429220984483248 started by @arumes31

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[arumes31]

Closing as a duplicate. Superseded by the newer #111, which covers the same disk-I/O-in-monitor-loop change. Consolidating review on #111.

[google-labs-jules]

Closing as a duplicate. Superseded by the newer #111, which covers the same disk-I/O-in-monitor-loop change. Consolidating review on #111.

Understood. Acknowledging that this work is a duplicate of #111 and stopping work on this task.