feat(guard): add guard config option to control auth guard used for logging

[jfrosorio]

Closes #30

The LogApiRequest middleware resolved the user via auth()->user(), i.e. the request's default guard. When no auth:<guard> middleware had called shouldUse(), this silently fell back to config('auth.defaults.guard') (typically web), which may not be the guard the application authenticates its API with.

This PR adds a guard option to config/api-logs.php:

• 'guard' => null (default) keeps the current behavior — the request's default guard is used.
• Setting a guard name (e.g. 'sanctum') pins the guard used to resolve the user a logged request is attributed to.

Includes feature tests covering both the configured-guard-authenticated and configured-guard-unauthenticated cases, plus README documentation.

[Copilot]

Pull request overview

This PR adds an api-logs.guard configuration option to control which Laravel auth guard is used by the LogApiRequest middleware when resolving the authenticated user (“causer”) for an API log entry, addressing cases where the default guard may not reflect the API’s authentication guard.

Changes:

• Added guard option (default null) to config/api-logs.php to optionally pin the guard used for user resolution.
• Updated LogApiRequest middleware to resolve the user via the configured guard.
• Added feature tests and README documentation covering configured-guard behavior.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
src/Http/Middleware/LogApiRequest.php	Uses config('api-logs.guard') to select the auth guard for resolving the user before logging.
config/api-logs.php	Introduces documented guard config option with default null to preserve current behavior.
tests/Feature/LogApiRequestMiddlewareTest.php	Adds tests verifying the configured guard is used and that logs are skipped when that guard is unauthenticated.
README.md	Documents the new guard config option and updates the config publishing section accordingly.

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