fix: add missing lang and country params to search tool schema

[MaxwellCalkin]

Summary

• The firecrawl_search tool's description examples show lang and country parameters ("lang": "en", "country": "us"), but these were missing from the Zod schema
• This causes Zod validation errors when LLMs follow the documented usage examples
• Both parameters are defined in the Firecrawl JS SDK's SearchParams interface (lang?: string, country?: string) and are supported by the Firecrawl API

Details

The tool description (lines 546-564) includes this example:

{
  "query": "latest AI research papers 2023",
  "limit": 5,
  "lang": "en",
  "country": "us",
  "sources": [{ "type": "web" }]
}

But the Zod schema only defined query, limit, tbs, filter, location, sources, scrapeOptions, and enterprise — missing lang and country. Any MCP client LLM that followed the example would get a validation error.

Test plan

• npm run build passes
• Verified lang and country match the SDK's SearchParams interface
• The execute handler uses { query, ...opts } destructuring, so new params are automatically forwarded to client.search()

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