Chore: Add debug logging for silent exception in RelationFinder.php

[zigzagdev]

Summary

What I have done

• Add opt-in debug logging to the catch (\Throwable $e) block in RelationFinder::getRelationshipFromMethodAndModel().
• Logging is disabled by default and can be enabled by setting 'debug_relations' => true in config/erd-generator.php.
• Add test to verify debug logging behavior when a method throws an exception.

Motivation

As reported in Issue #61, users have encountered silent failures inside the catch block of getRelationshipFromMethodAndModel, making it difficult to diagnose why relations are not detected.
This PR surfaces those errors in an opt-in manner, without polluting logs in production environments.

Changed

• src/RelationFinder.php: Wrapped Log::debug() with a config('erd-generator.debug_relations', false) guard
• config/erd-generator.php: Added commented-out debug_relations option with description
• tests/Fixtures/ModelWithThrowingMethod.php: Test model that throws an exception
• tests/GetModelRelationsTest.php: Test verifying the debug log output

Test Results