feat: add Anthropic tool_search_tool_bm25_20251119 for lazy loading#260

Dumbris wants to merge 1 commit intomainsmart-mcp-proxy/mcpproxy-go:mainfrom

feat/anthropic-tool-search-standardsmart-mcp-proxy/mcpproxy-go:feat/anthropic-tool-search-standardCopy head branch name to clipboard