This commit improves the test coverage for the `internal/data/sql`
package by adding comprehensive tests for several repositories and
refactoring the testing strategy to be more robust.
The following changes were made:
- Refactored the `analytics_repository_test.go` to use an in-memory
SQLite database instead of `sqlmock`. This makes the tests more
reliable and less brittle against GORM's SQL generation.
- Added new tests for `auth_repository.go` and
`copyright_claim_repository.go` using the same in-memory SQLite
database strategy.
- Added the missing `WorkID` field to the `CopyrightClaim` domain
entity to align it with the repository's logic.
This effort increased the test coverage for the `internal/data/sql`
package from 30.5% to 37.1%.
