Add per-call detail panel to the usage dashboard

[ogj130]

Summary

Add a "Call Details" panel to the dashboard: a paginated list of every assistant call showing
wall-clock duration, input/output tokens, cache hit rate, model, and reasoning effort. Filter by
model, provider, input/output token thresholds, and switch page size (5/10/20/50).

Changes

• Collect durationMs (step/start -> assistant/message) and effort (request/header reasoning
  effort) per call, keyed per session so concurrent sessions never bleed timing into each other.
• Add GET /usage-stats/v1/calls with date, scope, workspace, model, provider, token-threshold, and
  pagination filters. History without a paired step or header reports null without backfill.
• Reuse the shared collector in both replay (summarizeSession) and live (acceptLive) paths.
• Add a CallsPanel React component (7-column table + filters + page-size selector), bilingual copy
  (zh/en), and styles.
• Extend ActivityRecord with optional durationMs / effort; add CallsQuery / CallRecord /
  CallsPage types.

Files changed

• src/core.ts — collector state + aggregateCalls
• src/index.ts — /calls route + parsePagination
• src/client/index.tsx — CallsPanel component
• src/client/i18n.ts / src/client/styles.ts — bilingual copy + styles
• src/types.ts — new types + ActivityRecord extension
• tests/core.test.ts — 5 new tests (session isolation, pairing, filters)

Test plan

• npm run check — typecheck, 22 tests, build all pass

摘要

在仪表盘新增「调用明细」面板：以分页列表展示每次模型调用的真实耗时、输入/输出
Token、缓存率、模型与思考程度；支持按模型、提供商、输入/输出 Token
阈值筛选，并可切换每页条数（5/10/20/50）。

改动

• 按会话隔离采集 durationMs（step/start → assistant/message）与 effort（request/header 的
  reasoning effort），并发会话互不串扰。
• 新增 GET /usage-stats/v1/calls 接口，支持日期、任务范围、工作区、模型、提供商、Token
  阈值与分页过滤；缺少配对 step/header 的历史数据返回 null，不做回填。
• 实时路径（acceptLive）与历史回放路径（summarizeSession）复用同一套采集逻辑。
• 新增 CallsPanel React 组件（7 列表格 + 筛选 + 每页条数切换），含中英文文案与样式。
• 扩展 ActivityRecord（可选 durationMs/effort）；新增 CallsQuery/CallRecord/CallsPage
  类型。

涉及文件

• src/core.ts — 采集状态 + aggregateCalls
• src/index.ts — /calls 路由 + 参数解析
• src/client/index.tsx — CallsPanel 组件
• src/client/i18n.ts / src/client/styles.ts — 中英文文案与样式
• src/types.ts — 新增类型 + ActivityRecord 扩展
• tests/core.test.ts — 5 个新测试（会话隔离、配对、过滤）

验证

• npm run check — typecheck、22 项测试、构建全部通过

实际效果为：