adds additional brave-search-api params

[jonathansampson]

Introduces support for additional Brave Search API web-search parameters.

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Note

Medium Risk
Medium risk because BraveSearchTool now returns JSON-encoded structured results instead of the previous human-readable text, which may break downstream consumers expecting the old format. It also widens request parameter surface area and changes default query argument naming (while keeping input backward compatibility).

Overview
BraveSearchTool now supports many additional Brave web-search parameters (e.g., country, search_language, count/offset, safesearch, freshness, and several boolean flags), with Pydantic validation for constrained fields like freshness and safesearch.

The tool’s output format changes to a JSON list of result objects (with url, title, optional description, optional snippets) and requests are forced to result_filter=web; tests are updated to call query and to validate the JSON structure.

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[lorenzejay]

lovely ! tested and it works