feat: Add multi-architecture support for release binaries (#47)

This commit adds support for building and releasing binaries for multiple
architectures to address issue #46, specifically enabling AWS Bedrock AgentCore
deployments which require ARM64 Linux containers.

Changes:
- Updated Makefile to build architecture-specific binaries:
  * Linux: AMD64 and ARM64 (critical for AWS Graviton)
  * macOS: ARM64
  * Windows: AMD64 and ARM64
- Added backward compatibility aliases for existing build targets
- Updated GitHub Actions release workflow to upload all architecture variants
- New binary naming convention: vantage-mcp-server-{os}-{arch}

Benefits:
- Enables deployment on AWS Bedrock AgentCore (ARM64 requirement)
- Supports AWS Graviton EC2 instances
- Provides better ARM64 cloud infrastructure support
- Maintains backward compatibility with existing build commands

Fixes #46

version bump v0.0.6

Version update

chore: Bump version.

chore: Bump version

Merge pull request #25 from vantage-sh/nel/services

feat: Add list-cost-services tool.

Merge pull request #21 from vantage-sh/nel/read-only-check-endpoints

chore: Return read-only error when accessing tools.

fix: Workflow pass correct token.

cross builds for release (#16)

* cross builds for release

* with a github action

* fix: Correctly pass env in Makefile.

* fix: Use depot-ubuntu-22.04 for build.