feat: add surreal cache store alias

[ibourgeois]

Closes #26.

Summary

• add an explicit surreal cache store alias backed by Laravel's database cache driver on the Surreal connection
• document how to enable Surreal-backed cache storage and its current limiter caveat
• expand the Surreal cache integration test to cover a broader set of core cache operations

Verification

• vendor/bin/pint --dirty --format agent
• php artisan test --compact tests/Feature/DatabaseCacheOnSurrealTest.php

[Copilot]

Pull request overview

Adds an explicit surreal cache store alias (implemented via Laravel’s built-in database cache driver configured to use the surreal DB connection), documents how to enable Surreal-backed caching, and broadens the existing integration test coverage for cache operations against a real Surreal runtime.

Changes:

• Add cache.stores.surreal configuration as a first-class cache store alias.
• Update the Surreal cache integration test to use the surreal store and cover more core cache operations.
• Document Surreal-backed cache configuration and the current limiter/atomic semantics caveat.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
tests/Feature/DatabaseCacheOnSurrealTest.php	Switches the test to the new surreal cache store and expands covered cache operations.
config/cache.php	Introduces the surreal cache store alias backed by the database cache driver on the Surreal connection.
README.md	Documents enabling Surreal-backed cache storage and notes limiter caveats.

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