Add support for external monitoring of settings/admin/serverinfo and implement in eink server

[LizardKing00]

Overview

Add support to monitor the settings/admin/serverinfo endpoint via an external server monitoring tool. Implement the necessary endpoints and integration logic directly in the eink server.

Tasks

• Design and expose an endpoint or mechanism under settings/admin/serverinfo that reporting tools can access for monitoring status, health, and configuration.
• Evaluate and select a suitable external monitoring tool or protocol (e.g., Prometheus scrape endpoints, REST API for monitoring, or custom solution).
• Implement necessary backend logic in the eink server to expose required data (server statistics, version info, uptime, resource usage, etc.).
• Document the usage and integration steps for configuring external monitoring.

Acceptance Criteria

• The server provides a machine-readable output from settings/admin/serverinfo suitable for integration with typical monitoring tools.
• Documentation included for configuration and external integration.
• Passes all necessary code and integration tests.

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Label: enhancement