[FIX] Extract monitoring logic in monitorService

[arumes31]

This PR refactors the monitorService function in internal/monitor/monitor.go to improve maintainability and readability by extracting its core logic into modular helper functions:

• getLatestServiceConfig: Handles re-loading the service configuration from disk, allowing the monitor to react to changes (like pausing a service). It now uses index-based access to avoid returning the address of a loop variable.
• calculateGracePeriod: Centralizes the logic for determining if a service is eligible for restart based on its grace period.
• runMonitoringCycle: Encapsulates one iteration of the monitoring check, including status updates and failure handling.

Additional changes:

• Simplified the main loop in monitorService.
• Added a safety check to ensure the monitoring interval is at least 60 seconds if not specified or invalid.
• Re-added the "Paused" status update when a service is paused, ensuring UI consistency.
• Added comprehensive unit tests for calculateGracePeriod in internal/monitor/monitor_test.go.

These changes make the monitoring logic easier to test and reason about without altering the intended behavior of the system.

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PR created automatically by Jules for task 13536251921273154381 started by @arumes31

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