feat(tarko-interface): add webui.layout.enableSidebar config

[ulivz]

Summary

Adds webui.layout.enableSidebar configuration option to control sidebar visibility in the web UI.

• Added enableSidebar?: boolean to LayoutConfig interface in @tarko/interface
• Added helper function isSidebarEnabled() in @tarko/agent-ui config utilities
• Updated App.tsx to conditionally render sidebar based on configuration
• Defaults to true to maintain backward compatibility

Checklist

• Added or updated necessary tests (Optional).
• Updated documentation to align with changes (Optional).
• Verified no breaking changes, or prepared solutions for any occurring breaking changes (Optional).
• My change does not involve the above items.

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[ulivz]

Duplicate of #1624