Rtop 73 create runtime manager from python side

[thiagoralves]

This PR adds a RuntimeManager class that controls the runtime C core execution from the Python side. The user only needs to keep track of the main Python application. There is no need to keep track of the plc_main app anymore.

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[Copilot]

Pull Request Overview

This PR introduces a RuntimeManager class to control the runtime C core execution from the Python side, simplifying runtime management by eliminating the need to track the plc_main app separately.

• Replaces direct UnixClient and UnixLogServer usage with a unified RuntimeManager
• Adds process monitoring and automatic restart capabilities
• Consolidates runtime control methods (ping, start_plc, stop_plc) into the manager

Reviewed Changes

Copilot reviewed 3 out of 6 changed files in this pull request and generated 4 comments.

File	Description
webserver/runtimemanager.py	New RuntimeManager class with process lifecycle management and monitoring
webserver/unixclient.py	Removes PLC control methods (ping, start_plc, stop_plc) now handled by RuntimeManager
webserver/app.py	Replaces direct client/server usage with RuntimeManager integration

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