强化容器构建与 Agent 健康检查

[4evour]

迁移内容

• Agent 模块导入失败时直接终止镜像构建，不再用成功兜底掩盖错误
• 容器健康检查同时验证 C++ API 与 Python Agent
• 增加 Dockerfile 源码契约回归测试

验证

• node tests/test_reviewed_docker_contracts.js
• docker build -t tour-pass:pr-docker-health-audit .
• 容器状态：healthy
• node scripts/container_smoke.js http://127.0.0.1:8162（Agent v2.0.0、9588 个 POI、1758 条边、5 个候选方案）
• node scripts/verify_ui.js http://127.0.0.1:8162/（长沙、2 天、4 个站点、5 个侧栏入口）
• git diff --check

依赖关系

这是第 5 个堆叠 PR，基于前端竞态 PR #21。请按 #18 → #19 → #20 → #21 → 本 PR 的顺序合并；前序合并后将本 PR 的目标分支改回 main。

已知事项

Linux 编译仍显示仓库既有的未使用函数、多字节字符和日期格式化警告，本 PR 未扩大到这些无关问题。

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📥 Commits

Reviewing files that changed from the base of the PR and between d6b83c0 and 1bfba6b.

📒 Files selected for processing (3)

• CHANGELOG.md
• Dockerfile
• tests/test_reviewed_docker_contracts.js

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