refactor(uv): Migrate to UV Workspace approach

[Evergreenies]

This PR contains changes requested by #5250 .

Added support for UV workspace for the below subprojects -

 'langgraph'
 'langgraph-checkpoint'
 'langgraph-checkpoint-postgres'
 'langgraph-checkpoint-sqlite'
 'langgraph-prebuilt'
 'langgraph-sdk'
 'langgraph-cli'

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Project	Deployment	Preview	Comments	Updated (UTC)
langgraph-docs-preview	Ready	Preview	Comment	Sep 28, 2025 3:51am

[Evergreenies]

Hello @sydney-runkle Please review the changes and suggest me appropriate approach for sdk-py as it has different version.

[Evergreenies]

Hello @sydney-runkle ,

Are there there any plan to sync all packages on same Python (like Python3.12) version. This will help us to manages all packages in uv workspace.

If there is any plan, feel free to assign me these migrations tasks.

[Evergreenies]

@sydney-runkle can you please review this PR?

[Evergreenies]

Hello @sydney-runkle

I have made changes and included sdk-py in UV workspace.

Please take a look one more time.

[Evergreenies]

@sydney-runkle Looking to have review on this PR and want to know in which release it will be merged.

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[Evergreenies]

Hi @sydney-runkle , hope you're having a good week. I'm checking back on this PR. It's still a change I'm excited about contributing. Would it be possible for you or another team member to review it when you have a chance? I'm happy to make any changes requested. Thanks for your consideration!