fix(i18n): localize consumer detail overview and health diagnostics

[yyqdbngt]

Summary

The consumer group page is being localized in slices (offset reset, create/import, list done previously); this PR covers the detail modal overview and health-diagnostics tabs.

Localized in instance/consumer.tsx:

• Detail modal title fallback (Group 详情) and the 概览 / 健康诊断 tab labels.
• Overview tab: statistic cards (在线实例 / 总堆积 / 订阅 Topic 数), the descriptions (Group 名称 / 所属集群 / 订阅模式 / 消费类型 / 订阅组类型 / 消费延迟 / 最大重试次数 with its unit suffix / 创建时间 / 订阅 Topic), the online-instances section header, and the subscription consistency panel (header, re-check button, all six status messages - failed / checking / inconsistent count / unknown count / all consistent / none - and the 仅看不一致 checkbox). Unavailable-lag placeholders reuse the existing groupMgmt.lagUnavailable key.
• Health diagnostics tab: summary sentence + auto-refresh note, re-diagnose button, degraded-data banner, the four health cards (健康分 / 已知堆积 with 报告堆积 prefix / Queue 覆盖 with unknown-queue states / 客户端 with stale-heartbeat states), the no-risk success alert, the recommendations banner, and the health issues table (级别 / 诊断项 / 说明 headers and severity labels 风险 / 关注 / 提示 through a now-keyed helper).
• Reuses existing keys where wording matches (consumer.name, consumer.subMode, consumer.subGroupType, consumer.delay, consumer.maxRetry, consumer.createdAt, ...); 40 new consumer.* keys; zh byte-identical.

Why

Overview and health diagnostics are the richest surface of the group detail view; operators rely on these labels and status texts in the active language.

Testing

• tsc --noEmit passes
• eslint clean on the changed files
• vitest run ConsumerPage - 29/29 tests pass

[RockteMQ-AI]

Summary

fix(i18n): localize consumer detail overview and health diagnostics — consistent i18n localization. Clean, backward-compatible.

LGTM.

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