fix: resolve validation error "array type must have items" in ports schema

[bocharov62-bit]

Fixes issue #25.

The JSON schema generated for tuple[str, int] in Pydantic 2 (using prefixItems) lacks an items field, which causes validation errors in some strict MCP clients (like Copilot Agent and potentially Cursor) that expect array types to always have an items property.

By changing tuple[str, int] to list[Any] (or list[str | int]), Pydantic will generate a schema with an items property, resolving the "tool parameters array type must have items" error.

This also potentially addresses issue #38 where users were unable to use port mapping functions.