docs: add undatasio integration page and add undatasio to loader index

[hiten (lq1909017169)]

Overview

Adds a complete integration page for UnDatasIO (langchain-undatasio) document loader, covering installation, initialization, single/multi-file parsing, and lazy-loading usage examples.

Type of change

Type: New documentation page

Related issues/PRs

• GitHub issue: -
• Feature PR: -

• Linear issue: -
• Slack thread: -

Checklist

• I have read the contributing guidelines
• I have tested my changes locally using docs dev
• All code examples have been tested and work correctly
• I have used root relative paths for internal links
• I have updated navigation in src/docs.json if needed
• I have gotten approval from the relevant reviewers
• (Internal team members only / optional) I have created a preview deployment using the Create Preview Branch workflow

Additional notes

• New file: docs/src/oss/python/integrations/document_loaders/undatasio.mdx
• Also appended UndatasIO to the loader index (index.mdx) for discoverability.

[Lauren Hirata Singh (lnhsingh)]

Hi hiten (@lq1909017169), thanks for submitting your integration! Can you also add it to the All providers page (src/oss/integrations/providers/all_providers.mdx)? Thank you!

[hiten (lq1909017169)]

Hi Lauren Hirata Singh (@lnhsingh),

Thanks for the feedback!
I'll open a new PR shortly that includes the integration page and the entry in all_providers.mdx.

Appreciate your time!