[feature]: added external authentication to types for UserCommon

[foxriver76]

Link the feature issue which is closed by this PR

closes #1286

Implementation details

Added externalAuthentication optional property to UserCommon. It is Record<string, unknown> to allow for different external auths by name and the structure needs to be defined per implementation.

Tests

• I have added tests to test this feature
• It is not possible to test this feature

Documentation

• I have documented the new feature

Documenting it on the type level should be enough IMO, specific implementations should document the further structure then, like ioBroker/webserver#7

[GermanBluefox]

@foxriver76 do you have an example, how to use this?

[Copilot]

Pull Request Overview

This PR adds an optional externalAuthentication property to the UserCommon type to support various external authentication schemas. Key changes include:

• Updating the type definition to include externalAuthentication of type Record<string, unknown>.
• Adding tests to verify behavior when externalAuthentication is present.
• Updating CONTRIBUTING.md to use "npm ci" for dependency installation.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
packages/types-public/index.test-d.ts	Added a test case for externalAuthentication behavior.
CONTRIBUTING.md	Updated installation instructions to use "npm ci".

Comments suppressed due to low confidence (1)

packages/types-public/index.test-d.ts:87

• Consider replacing the no-op equality check with an actual assertion (e.g., using an assertion library) to validate that oidc.sub has the expected value.

oidc.sub === 'foo';

[foxriver76]

@foxriver76 do you have an example, how to use this?

Sure, as mentioned in the initial comment ioBroker/webserver#7 and the corresponding admin PR