fix(deploy): 完善流量录制持久化

[g1331]

Summary

将生产环境的流量录制 fixture 默认写入 /app/data/traffic-recordings，并通过 autorouter-data named volume 保留容器重建与版本升级后的录制文件。同时修正过期录制清理在文件竞态消失时的幂等计数语义。

Related Issue

无现成 Issue；本 PR 对应分支 fix/traffic-recording-persistence 的部署持久化意图。

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Refactoring (code improvement without changing functionality)
• Tests (adding or updating tests)
• Build/CI (changes to build system or CI configuration)

Changes

• 将 Compose 生产默认录制目录切换到持久化应用数据卷。
• 让 entrypoint 在迁移和启动前修复挂载卷权限，应用仍以 nextjs 用户运行。
• 补充旧 tests/fixtures 部署的备份、路径迁移和升级说明。
• 修正清理任务：文件在数据库索引删除后因竞态返回 ENOENT 时按幂等成功计数，不恢复可能已被其他清理任务删除的索引。
• 增加部署配置与清理竞态回归测试。

Test Plan

• Local focused tests pass (pnpm test:run tests/unit/services/traffic-recording-service.test.ts tests/unit/deployment/traffic-recording-persistence.test.ts)
• Type check passes (pnpm exec tsc --noEmit)
• Lint passes (pnpm lint)
• Manual Docker container/volume recreation smoke (Docker CLI unavailable in the local environment; to be covered by CI or a Docker-capable reviewer)

Checklist

• Code follows the project's coding standards
• Tests have been added where necessary
• Documentation has been updated (if applicable)
• Changes do not introduce security vulnerabilities
• Commit messages follow conventions

Additional Notes

本地 pre-commit hooks（Prettier、ESLint、TypeScript）均通过；pnpm docs:build 通过。旧部署必须在重建容器前按文档完成 fixture 迁移，否则旧容器可写层中的文件无法自动恢复。

[codecov]

Codecov Report

❌ Patch coverage is 90.62500% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.44%. Comparing base (16faa95) to head (4f13f03).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #277      +/-   ##
==========================================
+ Coverage   72.24%   72.44%   +0.20%     
==========================================
  Files         244      244              
  Lines       14416    14442      +26     
  Branches     4810     4817       +7     
==========================================
+ Hits        10415    10463      +48     
+ Misses       2618     2595      -23     
- Partials     1383     1384       +1     

Flag	Coverage Δ
verify	72.44% <90.62%> (+0.20%)	⬆️

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