Resolve conflicts: - .gitignore: keep nightly additions (.test, skills-lock.json) - relay/helper/price.go: keep both billingexpr and model imports - en.json / zh-CN.json: keep nightly's superset of i18n entries - service/billing_session.go: add missing 3rd arg to DecreaseUserQuota - en.json / zh-CN.json: deduplicate 129+320 duplicate i18n keys
