feat: v0.5.16 - migrate to Responses API (#586)

* refactor: migrate from /v1/runs to /v1/responses streaming API

Replace EventSource-based polling with direct SSE streaming via the
/v1/responses endpoint across all server-side callers (chat-run-socket,
context-compressor, gateway-client, agent-clients). Messages are now
written to DB in real-time during streaming, eliminating post-run sync.
Frontend chat store adds tool_call_id tracking for deduplication.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

* chore: bump version to 0.5.16 and add changelog

- Persist real API usage to usage table on response.completed
- Remove unused codex_reasoning_items field from message schema
- Fix unused variable warnings in chat-run-socket
- Bump version to 0.5.16
- Add changelog entries for 0.5.16 (8 locales)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

packages/client/src/i18n/locales/zh.ts

@@ -914,6 +914,10 @@ export default {
     new_0_5_15_9: '修复 Hermes Markdown 媒体渲染与同步重试',
     new_0_5_15_10: '重构移除上游环境变量依赖',
     new_0_5_15_11: '如果看板功能无法使用，请升级 hermes-agent',
+    new_0_5_16_1: '聊天流式接口从 /v1/runs 迁移至 /v1/responses，降低延迟',
+    new_0_5_16_2: '持久化真实 API 用量（token、缓存、推理）到用量统计表',
+    new_0_5_16_3: '官网导航栏新增 QQ 群二维码',
+    new_0_5_16_4: '移除消息 schema 中未使用的 codex_reasoning_items 字段',
     new_0_5_13_1: '新增消息队列，顺序处理运行请求，避免并发冲突',
     new_0_5_13_2: '支持二级 Skills 目录结构，扁平化 Skill 归入"杂项"分类',
     new_0_5_13_3: '启动同步时过滤临时会话（eph_*），避免导入内部会话',