fix(Zep Vector Store Node): Cloud vector store integration

[burivuhster]

Summary

This PR addresses Zep Vector Store issue when cloud option is selected.

Related Linear tickets, Github issues, and Community forum posts

• https://community.n8n.io/t/zep-vector-store-failed-to-parse-url-from-undefined-healthz/64343
• https://linear.app/n8n/issue/AI-537/bug-zep-vector-store-undefined-apiurl-when-cloud-option-is-selected-in

Review / Merge checklist

• PR title and summary are descriptive. (conventions)
• Docs updated or follow-up ticket created.
• Tests included.
• PR Labeled with release/backport (if the PR is an urgent fix that needs to be backported)

[codecov]

Codecov Report

Attention: Patch coverage is 62.50000% with 3 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...vector_store/VectorStoreZep/VectorStoreZep.node.ts	62.50%	3 Missing ⚠️

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