Upgrade fastmcp

[wzxxing]

Summary

Changes

Removed fastmcp Patch (Merged Upstream)

• Deleted: mcp_proxy_for_aws/fastmcp_patch.py - The monkey patch for fastmcp initialization error handling
• Deleted: tests/unit/test_fastmcp_patch.py - Tests for the old patch
• Modified: mcp_proxy_for_aws/init.py - Removed patch import

Reason: The fix from jlowin/fastmcp#2531 was merged upstream, so our local patch is no longer needed. FastMCP now natively handles McpError during initialization.

Updated Dependencies

• Modified: pyproject.toml - Upgraded fastmcp to v2.14.1

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• I have reviewed the contributing guidelines
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• Changes have been tested
• Changes are documented

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