feat: Add message UUIDs to get_messages response (Issue #77)

[slyt3]

Added ids field to GetMessagesOutput in Python SDK

• Extract and return message UUIDs in Go converter
• Add comprehensive tests for ID extraction and ordering
• Verify end-to-end integration with test script

Changes

• Python SDK: Added ids: list[str] field to GetMessagesOutput model
• Go API Server: Modified converter to extract and return message UUIDs
• Tests: Added 6 comprehensive test cases covering edge cases and integration

API Changes

Before

msgs = client.sessions.get_messages(session_id='xxx')
print(msgs.items)  # Only had message content

After

msgs = client.sessions.get_messages(session_id='xxx')
print(msgs.items)  # Message content
print(msgs.ids)    # Corresponding UUIDs

Testing

• All Go tests pass (go test)
• End-to-end integration test verified
• IDs order matches items order
• Works with all formats (OpenAI, Anthropic, Acontext)

This should close issue #77

Related to Issue (#77)

Tasks

Please ensure your pull request meets the following requirements:

• Add ids field to GetMessagesOutput model in Python SDK
• Modify Go converter to extract message UUIDs
• Add comprehensive unit tests (6 test cases)
• Verify end-to-end integration with test script
• Ensure IDs order matches items order

Impact Areas

Which part of Acontext would this feature affect?

• Client SDK (Python)
• Client SDK (TypeScript)
• Core Service
• API Server (Go)
• Dashboard
• CLI Tool
• Documentation
• Other: please_specify_here

Checklist

• Open your pull request against the dev branch.
• All tests pass in available continuous integration systems (e.g., GitHub Actions).
• Tests are added or modified as needed to cover code changes.

[slyt3]

Forgot to implement TS SDK gonna fix it easily

[slyt3]

Additional Notes

While implementing this feature, I discovered that 4 existing Python SDK tests were missing the new required ids field in their mocked responses, causing them to fail. I've updated these test mocks to include ids: [] to maintain compatibility:

• test_async_sessions_get_messages_forwards_format
• test_sessions_get_messages_forwards_format
• test_sessions_get_messages_with_edit_strategies
• test_sessions_get_messages_without_edit_strategies

All tests now should pass

The ids field is required in the GetMessagesOutput model, so any mocked API responses must include it going forward.

[slyt3]

Finished, everything should work @GenerQAQ @gusye1234