feat: add entity replication

[elpete]

Closes #42

Issue review

Fit score: 9/10. Replicating a persisted record is a common ORM operation, and Quick already has nearly all the necessary primitives. A dedicated method is clearer and safer than cloning and manually clearing identity state.

Reasons for

• concise public API for copy-as-new workflows
• reliably removes single or composite primary keys
• provides a lifecycle hook for adjusting replica defaults
• optional exclusions avoid copying sensitive or unique attributes

Reasons against

• relationships are intentionally not copied
• unique fields still require caller or hook customization before save

Implementation

• adds replicate( except = [] ) returning a new, unloaded entity
• copies nulls while excluding all primary-key columns and caller exclusions
• adds entity postReplicate and interceptor quickPostReplicate hooks with entity and original

Reproduction

Public-API tests first failed with QuickMissingMethod because replicate() did not exist; event tests also could not reach either requested hook.

Validation

• focused clone/replication/event coverage: 8 passed, 0 failed, 0 errors
• full suite: 499 passed, 0 failed, 0 errors, 3 skipped
• box run-script format
• git diff --check
• qb dependency: 14.0.0-beta.3