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This section details on the original issue you should resolve

<issue_title>Adding 'authParams' to authClientCollection clients</issue_title>
<issue_description>### Proposed new feature or change

Hi,

There are use cases in which additional OAuth parameters may need to be passed in the URL. For example Google oauth with multiple accounts choices may simply use by default the account that had access previously granted instead of offering to pick another account:

'authClientCollection' => [
            'class' => \yii\authclient\Collection::class,
            'clients' => [
                'google' => [
                    'class' => \yii\authclient\clients\Google::class,
                    'clientId' => 'XXX',
                    'clientSecret' => 'YYY',
                    'scope' => 'openid email profile',
                    'authParams' => [
                        'prompt' => 'select_account', // force account chooser
                        // optional: 'access_type' => 'offline', 'include_granted_scopes' => 'true'
                    ],
                ], ...

I looked through code and additional 'params' are merged in different url building methods (like buildAuthUrl(array $params = [])) with the default auth parameters, however, there is no way to pass those params to the existing methods from the component config.

Could we add/parse/merge an 'authParams' array in config?

</issue_description>

<agent_instructions>Make it available for any client. Do not break backwards compatibility.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

@samdark Do you mean auth URL? @samdark Thanks for explaining.

• Fixes Adding 'authParams' to authClientCollection clients #73

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[samdark]

@claude[agent] rebase. Re-verify. Fix mutation tests if these concern the feature.

[Claude]

@claude[agent] rebase. Re-verify. Fix mutation tests if these concern the feature.

Rebased on master and added getter test for better mutation coverage (cddf973).

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