refactor: deepen ETL infrastructure ownership

[zbnerd]

Summary

• Extract pipeline artifact identity, storage, and lifecycle ownership into module-pipeline-artifact.
• Centralize Kafka delivery outcomes, retry/DLT handling, topology checks, and listener runtime in module-pipeline-messaging.
• Move the valuation kernel into module-core and Nexon access into module-nexon-client.
• Localize ETL executors, schedulers, subscriptions, and lifecycle wiring to external-api, calculator, synchronizer, and cleanup so their active runtime graphs no longer depend on module-infra.
• Retain compatibility adapters and add source/dependency/runtime guards for the new boundaries.

Verification

• Artifact identity guard, Kafka DLT topology tests, core dependency rules, and verifyActiveEtlInfraIsolation
• External-api, calculator, and synchronizer subscription tests
• Four worker Boot JAR builds
• Four worker runtime smoke: actuator health UP, then graceful SIGTERM shutdown
• Active worker source guards and git diff --check
• Full repository test/root check (intentionally skipped to keep the refactor bounded)
• Load/performance tests, Testcontainers suites, and live Nexon traffic (intentionally skipped for safety and runtime)

Review notes

• The diff is large because the calculator-owned valuation CSV contains 413,802 rows and is relocated with the ownership change.
• Compatibility adapters remain where downstream callers still need migration seams.
• Runtime smoke used isolated Kafka consumer groups with external-api startup work disabled; no database reset or load test was performed.