docs: add Couchbase integration page

[teetangh]

Summary

• Add docs/integrations/couchbase.md — integration docs page with Python and TypeScript code examples, available tools table, configuration reference, and additional resources
• Add docs/integrations/assets/couchbase.png — Couchbase logo icon for the catalog card

Follows the existing pattern from mongodb.md and qdrant.md. No changes to mkdocs.yml or index.md needed — integrations are auto-discovered.

Test plan

• Run mkdocs serve and verify Couchbase card appears at /adk-docs/integrations/
• Verify the "data" filter shows Couchbase alongside MongoDB, Qdrant, Pinecone
• Click through to the full page and verify code examples, tools table, and links render correctly

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[google-cla]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

View this failed invocation of the CLA check for more information.

For the most up to date status, view the checks section at the bottom of the pull request.

[koverholt]

Thanks for the PR and contributing to the ADK ecosystem!

I tested the code examples with an ADK agent + Couchbase cluster and everything works as expected.

I left one comment about the sample agent link, once you address that and the Contributor License Agreement (see failing CI test for details), this will be ready to merge.

[koverholt]

LGTM, thanks again for your contribution!

[koverholt]

@teetangh, once you are able to sign the CLA, then we can merge this PR.

[teetangh]

Hi @koverholt, thanks for the approval and patience on this.

Quick update on the CLA situation: my commits were authored with a personal email that isn't covered by our Corporate CLA. I've now added my Couchbase corporate email (kaustav.ghosh@couchbase.com) as a verified email on my GitHub account, and I'm coordinating with our IT team to confirm it's in the CLA contributor group.

Once that's confirmed, I'll amend the commit author email to use the corporate address and force push to update this PR, which should resolve the CLA check.

Additionally, our team may transfer this fork from my personal account to our Couchbase organization for better collaboration. If that transfer breaks the PR reference, I'll open a fresh one with the same changes.

[teetangh]

Hi @koverholt, we've created a new PR #1475 with the same changes from a CLA-covered account to unblock the merge while we work on adding new contributors to our Corporate CLA. Please review #1475 instead.

[koverholt]

Thanks! Closing this PR in favor of #1475.