refactor(api): migrate workspace current response from marshal_with to BaseModel

[ai-hpc]

Part of #28015

Summary

Migrate /workspaces/current (TenantApi.post) response serialization from @marshal_with to a Pydantic BaseModel (TenantInfoResponse) while preserving existing response payload shape and status code behavior. Normalize enum-like fields and datetime timestamps.

Checklist

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran make lint and make type-check (backend) and cd web && pnpm exec vp staged (frontend) to appease the lint gods

[github-actions]

Pyrefly Diff

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[Copilot]

Pull request overview

This PR migrates the /workspaces/current (and deprecated /info) response serialization in TenantApi.post from Flask-RESTX @marshal_with to a Pydantic response model (TenantInfoResponse), aiming to preserve the existing payload shape while normalizing enum-like values and timestamps.

Changes:

• Introduces TenantInfoResponse (Pydantic ResponseModel) with validators to normalize enum-like fields and created_at timestamps.
• Updates TenantApi.post to serialize via TenantInfoResponse.model_validate(...).model_dump(mode="json") and updates the documented 200-response schema.
• Adds a unit test covering enum/datetime normalization behavior of TenantInfoResponse.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
api/controllers/console/workspace/workspace.py	Adds TenantInfoResponse and switches /workspaces/current response serialization to Pydantic-based dumping + updates response documentation.
api/tests/unit_tests/controllers/console/workspace/test_workspace.py	Adds a unit test verifying TenantInfoResponse normalizes enum-like inputs and datetimes to the expected JSON-friendly forms.

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