RSPEED-3313: inline single-use helpers and drop redundant None assignments in rlsapi_v1

[major]

Pure refactor of src/app/endpoints/rlsapi_v1.py to reduce indirection and redundant code.

• Inline _get_cla_version, _get_configured_default_model_name, _is_verbose_enabled, and _get_prompt_template at their sole call sites
• Reduce _compile_prompt_template lru_cache maxsize from 8 to 1 (only one system prompt exists at a time)

No behavior change. All 63 existing unit tests pass without modification.

[coderabbitai]

Walkthrough

The /infer endpoint now resolves the system prompt directly, derives Splunk telemetry fields inline, and computes verbose mode inline from request and configuration.

Changes

RLSAPI v1 infer path cleanup

Layer / File(s)	Summary
System prompt compilation src/app/endpoints/rlsapi_v1.py	_build_instructions selects the prompt source inline and renders it through _compile_prompt_template.
Telemetry and verbose flag src/app/endpoints/rlsapi_v1.py	_queue_splunk_event derives the model name and cla_version inline, and infer_endpoint computes verbose_enabled inline from request metadata and configuration.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Suggested labels

ok-to-test

Suggested reviewers

• tisnik

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main refactor: inlining single-use helpers and removing redundant None assignments in rlsapi_v1.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

✨ Simplify code

• Create PR with simplified code

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