feat: multi region

[pingxin403]

Description

Type of Change

• 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 not work as expected)
• Documentation update
• Refactoring (no functional changes)
• Performance improvement
• Test coverage improvement

Related Issues

Fixes #
Related to #

Changes Made

Services Affected

• Hello Service (Java)
• TODO Service (Go)
• Web Application (React)
• API Contract (Protobuf)
• Infrastructure/Tools
• Documentation

Testing

Unit Tests

• Added/updated unit tests
• All unit tests pass

Integration Tests

• Added/updated integration tests
• All integration tests pass

Manual Testing

Checklist

• My code follows the project's code style guidelines
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings or errors
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published

Protobuf Changes (if applicable)

• I have updated the Protobuf definitions in api/v1/
• I have run make proto to generate code for all languages
• I have committed the generated code
• I have verified that make verify-proto passes

Documentation (if applicable)

• I have updated the README.md
• I have updated API documentation
• I have updated architecture diagrams (if needed)

Screenshots (if applicable)

Additional Notes

Reviewer Notes

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For Reviewers:

• Code quality and style
• Test coverage
• Documentation completeness
• Breaking changes identified
• Performance implications considered