fix(dconfig): cache configuration objects for the compositor lifetime - #1252

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/setup-go@v3. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Include file: <QHash> not found. Please note: Cppcheck does not need standard library headers to get proper results.

The function 'initialUserConfig' is never used.

The function 'initializeUserConfigs' is never used.

The function 'outputConfig' is never used.

Include file: <DConfig> not found. Please note: Cppcheck does not need standard library headers to get proper results.

Include file: "treelanduserconfig.hpp" not found.

Include file: "treelandconfig.hpp" not found.

Include file: "seatuserconfig.hpp" not found.

Include file: "outputconfig.hpp" not found.