chat : pass reasoning_effort to template

chat : pass reasoning_effort to template

* chat: add reasoning_effort to common_chat_templates_inputs

Store OpenAI Chat Completions reasoning_effort and make it
available to jinja templates (with model specific translations
where required).

Assisted-by: llama.cpp:Muse-Glimmer-30B
* server : fixup reading reasoning effort from body

server_chat_convert_responses_to_chatcmpl already handles conversion of
Responses API reasoning.effort to reasoning_effort

* chat : expose reasoning effort

Assisted-by: Claude Opus 5
* chat : add reasoning_effort to generation_params

Assisted-by: Claude Opus 5
* chat : move reasoning_effort next to enable_thinking

Assisted-by: Claude Opus 5
* cont : mirror preserve_reasoning

* cont : pass context through analyze function

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Co-authored-by: Alde Rojas <redacted>