feat: DQE metadata

[br4vesirrobin]

Summary

• add fixture-backed DQE profile metadata fields (locale, release year, jurisdiction, source tier)
• expose DQE profile metadata on both classification and quantity annotations
• validate invalid profile values without changing parser support status

Validation

• cargo test --test dqe_quantity
• cargo clippy --all-targets --all-features -- -D warnings
• cargo test --all-targets --all-features
• cargo check --all-targets --all-features

Autobahn slice: GCS-010 DQE Portugal/Lusophone profile metadata.