Summary

• add public CopyToContainerOptions with copyUIDGID and noOverwriteDirNonDir
• thread copy options through container archive copy plumbing and pre-start copy operations via withCopyToContainerOptions(...)
• add integration coverage for copyUIDGID using explicit non-default uid/gid values
• document copy options and their behavior

Verification commands run

• npm run format
• npm run lint
• npm test -- packages/testcontainers/src/generic-container/generic-container.test.ts -t "copyUIDGID"

Test results summary

• format and lint passed
• targeted copyUIDGID integration tests passed (2 tests)

Closes #605