Update error handling to use ErrorData consistently

[alezkv]

Also:
Updated mcp dependency from 1.0.0 to 1.1.3

Description

fixes #471

Server Details

• Server: fetch
• Changes to: server

Motivation and Context

This aligns with MCP's error handling patterns and provides better structured error information.

How Has This Been Tested?

Tested with npx @modelcontextprotocol/inspector

Breaking Changes

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the MCP Protocol Documentation
• My changes follows MCP security best practices
• I have updated the server's README accordingly
• I have tested this with an LLM client
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have documented all environment variables and configuration options

Additional context

[alezkv]

@dsp-ant Could you please take a look at this?