改为显式配置管理员账号

[4evour]

迁移内容

• 移除空数据库下自动把下一位注册用户提升为管理员的隐式规则
• 用户名注册只按用户名白名单判断，邮箱注册只按邮箱白名单判断
• README、API、部署文档与 Render 配置补充 TOURPASS_ADMIN_USERS
• 增加显式管理员引导策略回归测试

行为变化

• 未配置 TOURPASS_ADMIN_USERS：所有普通注册均为 user
• 已配置：仅白名单中的用户名或邮箱在注册时成为 admin
• 已存在用户的角色不受影响

验证

• node tests/test_reviewed_admin_policy_contract.js
• oxlint 管理员策略测试文件
• MSVC Release 构建通过
• CTest 1/1 通过
• git diff --check

依赖关系

这是第 6 个堆叠 PR，基于容器健康 PR #22。请按 #18 → #19 → #20 → #21 → #22 → 本 PR 的顺序合并；前序合并后将本 PR 的目标分支改回 main。

部署提醒

需要管理员账号的环境必须在目标账号首次注册前配置 TOURPASS_ADMIN_USERS。该变量支持逗号分隔的用户名或邮箱。

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📥 Commits

Reviewing files that changed from the base of the PR and between 6ba74cd and 459aacd.

📒 Files selected for processing (7)

• CHANGELOG.md
• README.md
• docs/api.md
• docs/deployment.md
• render.yaml
• src/api.cpp
• tests/test_reviewed_admin_policy_contract.js

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