deploy: chore(main): release 0.31.0 (googleapis#2814)

🤖 I have created a release *beep* *boop*
---

##
[0.31.0](googleapis/mcp-toolbox@v0.30.0...v0.31.0)
(2026-03-26)

### ⚠ BREAKING CHANGES

* release upgraded docsite
([googleapis#2831](googleapis#2831))
* **http:** sanitize non-2xx error output
([googleapis#2654](googleapis#2654))
* add a new `enable-api` flag
([googleapis#2846](googleapis#2846))
* remove deprecations and update tools-file flag
([googleapis#2806](googleapis#2806))

### Features

* Add a new `enable-api` flag
([googleapis#2846](googleapis#2846))
([7a070da](googleapis@7a070da))
* **auth:** Add generic `authService` type for MCP
([googleapis#2619](googleapis#2619))
([f6678f8](googleapis@f6678f8))
* **auth:** Add Protected Resource Metadata endpoint
([googleapis#2698](googleapis#2698))
([b53dcf2](googleapis@b53dcf2))
* **auth:** Support manual PRM override
([googleapis#2717](googleapis#2717))
([283e4e3](googleapis@283e4e3))
* **dataplex:** Add support for lookup context tool.
([googleapis#2744](googleapis#2744))
([facb69d](googleapis@facb69d))
* Remove deprecations and update tools-file flag
([googleapis#2806](googleapis#2806))
([ab64c95](googleapis@ab64c95))

### Bug Fixes

* **ci:** Remove search index generation from preview deployment
workflow
([googleapis#2859](googleapis#2859))
([f8891b8](googleapis@f8891b8))
* **docs:** Skip empty folders in pagination & reduce PR comment noise
([googleapis#2853](googleapis#2853))
([9ebd93a](googleapis@9ebd93a))
* **http:** Sanitize non-2xx error output
([googleapis#2654](googleapis#2654))
([5bef954](googleapis@5bef954))
* **skills:** Fix integer parameter parsing through agent skills
([googleapis#2847](googleapis#2847))
([4564efe](googleapis@4564efe))

### Documentation

* Release upgraded docsite
([googleapis#2831](googleapis#2831))
([5b25ce0](googleapis@5b25ce0))

---
This PR was generated with [Release
Please](https://github.com/googleapis/release-please). See
[documentation](https://github.com/googleapis/release-please#release-please).

---------

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>
Co-authored-by: Yuan Teoh <45984206+Yuan325@users.noreply.github.com> c6b811c

Author: pull[bot]

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