Update 1T model and catalytic boundary condition handling in NEMO

[raghava-davuluri]

Proposed Changes

Give a brief overview of your contribution here in a few sentences.
This PR updates the 1-temperature (1T) model and catalytic boundary condition handling
in the NEMO solver.

Related Work

Resolve any issues (bug fix or feature request), note any related PRs, or mention interactions with the work of others, if any.
This work builds on existing NEMO solver infrastructure in the lab codebase and does not directly resolve a tracked issue.
No related pull requests at this time.

PR Checklist

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• I have added a test case that demonstrates my contribution, if necessary.
• I have updated appropriate documentation (Tutorials, Docs Page, config_template.cpp), if necessary.