feat: implement the Surreal Eloquent driver foundation

[ibourgeois]

Context

As a developer building on SurrealDB, I need an initial Eloquent-compatible foundation so application models can begin persisting through a Laravel-native API.

Acceptance Criteria

• A SurrealDB connection and driver foundation is added for application data access.
• At least one model can complete a basic CRUD flow through the new foundation.
• The implementation is covered by automated tests.
• Configuration and service registration are documented.

Notes

This is the base data access layer and should stay focused on model persistence first.

Out of Scope

• Cache, queue, and session backends
• Full GraphRAG-specific APIs