feat: enhance GORMCache functionality with transaction support

[molon]

xRef:

[Copilot]

Pull request overview

This PR adds transaction support to the GORMCache implementation, allowing cache operations to participate in database transactions. The changes enable transactional cache operations that can be committed or rolled back atomically with other database operations.

Key changes:

• Added context-based transaction support with WithGORMTx and GetGORMTx helper functions
• Modified all GORM cache methods (Migrate, Set, Get, Del) to support optional transactions via context
• Added comprehensive test coverage for transaction commit, rollback, isolation, and delete scenarios

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 5 comments.

File	Description
gorm.go	Implements transaction support using context pattern with cmp.Or fallback for all cache operations
gorm_test.go	Updates test helper to return DB instance and adds four comprehensive transaction tests
ristretto_test.go	Simplifies type parameter usage in test helper by relying on type inference
client_test.go	Updates test to accommodate new test helper signature

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