fix: send xAI Responses native web search - #10170

Motivation

Fixes #9723.

The xAI template now uses the openai_responses adapter, but xai_native_search was still displayed only for the legacy xai_chat_completion adapter. In addition, the Responses provider did not add the native web_search tool, so recent-information requests could not use xAI web search.

Changes

• Allow the xai_native_search condition to match either the legacy xAI adapter or the Responses adapter.
• Extend the shared configuration condition evaluators so an array value means "match any" while different condition keys remain ANDed.
• When native search is enabled for an xAI provider, add {"type": "web_search"} to Responses requests in both non-streaming and streaming paths.
• Preserve existing function tools and avoid adding duplicate web_search tools.
• Update the native search hint in all supported dashboard locales.

Testing

• Added failing-first tests for the provider metadata condition, non-streaming request tools, and streaming request tools.
• uv run pytest tests/test_openai_responses_source.py -q — 11 passed.
• uv run ruff format --check <changed Python files> and uv run ruff check <changed Python files> — passed.
• cd dashboard && npx pnpm@10 run typecheck — passed.
• git diff --check — passed.

Summary by Sourcery

Enable xAI native web search for the Responses adapter and expose its configuration consistently across the dashboard.

New Features:

• Enable native xAI web search for OpenAI Responses requests in both streaming and non-streaming modes.

Bug Fixes:

• Fix visibility of the xAI native search option for providers using the Responses adapter.
• Prevent duplicate native web-search tools while preserving configured function tools.

Enhancements:

• Allow configuration conditions to match any of several values while retaining AND semantics across condition keys.

Documentation:

• Update the xAI native search hint across supported dashboard locales.

Tests:

• Add coverage for xAI Responses metadata visibility and native search tools in streaming and non-streaming requests.