feat: analytics parity — tool cost, date ranges, budgets, query explorer, replay, snapshots (v2.4.0)

Analytics parity phases 2–7 (docs/plans/analytics-parity/), built on
138e706 and ported onto v2.3.1:
- Cost by AI tool (?tool= on cost/analytics/stats/workflows, by_tool,
  Codex fast/priority and flex tiers, agenthub_cost_usd_total{tool,model})
- Date ranges (from/to) on cost/analytics/workflows; Analytics range select
  with Today / This week (Monday) / This month (1st) / 7d / 30d / 90d / All /
  Custom; workflow filters carried into workflow-stats.js (read worker)
- Budgets and cost alerts as alert rule types (alert_rules rebuilt without
  its rule_type CHECK), GET /api/budgets/status, rule preview, spend pace,
  status-bar budget chip; rules stay editable in place
- Query Explorer (/query, allowlisted sort, CSV/JSON export) and scheduled
  reports (report_definitions/report_runs, Settings → Reports)
- Session Replay tab and immutable snapshots (session_snapshots, /snapshot/:token)
- Remote Codex sync, push ingest with a hashed token, privacy redaction and
  ignored folders (Settings → Data), Cursor sessions (no cost)
- Read-only MCP server, statusline, Grafana/Prometheus files

Also: resizable sidebar, pet run/wave animations, the workspace home keeps a
half-typed prompt, and the pre-commit hook runs only the related tests for a
small commit.

README.vi.md

@@ -269,8 +269,13 @@ npm run test:server    # node:test
 npm run test:client    # Vitest
 ```
 
-Cả hai phải xanh (pass) trước khi commit; pre-commit hook chạy chúng cộng
-thêm Prettier.
+Cả hai phải xanh (pass) trước khi commit. Pre-commit hook (`.husky/pre-commit`)
+chạy Prettier, rồi chạy những test mà commit cần: cả hai bộ đầy đủ cho commit
+lớn hoặc rủi ro (hơn 10 file code, đổi dependency, cấu hình build/test hay
+chính hook, có xoá file), chỉ test liên quan cho commit nhỏ (`vitest related`
+cho `client/`, các file test server có nhắc tới module được stage), và không
+chạy test nào nếu chỉ sửa tài liệu. `AGENTHUB_FULL_TESTS=1 git commit …` buộc
+chạy cả hai bộ đầy đủ.
 
 ## Cấu trúc thư mục