from_json no longer needed in gemma templates

[dkalinowski]

No description provided.

[Copilot]

Pull request overview

This PR updates the Gemma chat templates to stop relying on from_json for tool-call arguments and to drop rendering of the response field in tool definitions, aligning the template output with the current tool-call/message structures used in OVMS LLM tests and examples.

Changes:

• Remove rendering of the function.response schema block from the Gemma tool declaration formatter.
• Update the Gemma example template to render tool-call arguments directly as a mapping (no from_json conversion) and adjust its header note accordingly.
• Add a short “modifications” header comment to the test Gemma template for parity/clarity.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/test/llm/chat_templates/chat_template_gemma.jinja	Removes formatting for the response field in tool definitions and adds a short header note describing the modification.
extras/chat_template_examples/chat_template_gemma.jinja	Removes from_json usage and renders function['arguments'] directly when it is a mapping (retaining string fallback).