- client.ts: wrap success response.json() in try-catch to handle
  empty/non-JSON responses gracefully
- README.md, docs/en-US/mcp-server.md, docs/zh-CN/mcp-server.md:
  update params_to_tool type from string to object, fix examples
  to use object literal instead of JSON.stringify

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>