Clean unused helpers and config paths

[HorGonAI]

Motivation

• Remove dead code and unused configuration handling to simplify maintenance and reduce build surface.
• Avoid duplicated screenshot send logic by centralizing it into a single helper to reduce repetition and potential bugs.
• Remove stale build reference to a non-existent include directory to prevent confusing CMake setups.

Description

• Deleted unused helpers and command execution features: removed runCommand, getStatus, buildHelp, the commands map in Config, and the related config parsing/serialization.
• Replaced repeated screenshot capture + send blocks with a single sendScreenshot helper and updated all call sites to use it.
• Removed unnecessary includes (<array>, <cstring>) and the unused kMaxMessageLength constant.
• Simplified the Web App client by removing the unused sendWebAppData function and a redundant Telegram presence check, and removed the include directory entry from CMakeLists.txt.

Testing

• No automated tests were executed for this change.

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Codex Task