Add ReplicaStatusTag component + Storybook story

[agatha197]

Parent Story: FR-2658

Spec: .specs/FR-1368-endpoint-deployment-migration/spec.md §ReplicaStatusTag 컴포넌트

Files to change

• react/src/components/ReplicaStatusTag.tsx (NEW)
• react/src/components/ReplicaStatusTag.stories.tsx (NEW) — or placed under packages/backend.ai-ui if deemed reusable; default to react/src/components/

Implementation notes

export interface ReplicaStatusTagProps extends Omit<BAITagProps, 'color'> {
  status: RouteHealthStatus | LivenessStatus;
  showTooltip?: boolean;
}

Color mapping:

• NOT_CHECKED → gray/default
• HEALTHY → green/success
• UNHEALTHY → red/error
• DEGRADED → amber/warning

Tooltip text (use i18n keys from sub-task FR-2666):

• NOT_CHECKED: "초기 지연 기간 중. 첫 번째 헬스체크 전 상태입니다."
• HEALTHY: "정상. AppProxy Active Pool에 포함되어 트래픽을 수신 중입니다."
• UNHEALTHY: "비정상 확정. 연속 실패 횟수 초과로 Active Pool에서 제외되었습니다."
• DEGRADED: "헬스체커 도달 불가 유예 상태. Active Pool에서 임시 제외되었습니다."

Extends BAITag per .claude/rules/component-props-extension.md.

Storybook story should cover every status value.

Acceptance

• Component renders each status with the correct color + label + tooltip
• Props pass through to BAITag via ...rest
• Storybook stories exist and lint clean
• Review complexity: Medium

JIRA Issue: FR-2667