fix(standalone-api): /status 返回真实包版本（去掉硬编码常量）

[modusensus]

问题

GET /status 返回的版本号来自 src/api-standalone.js 内的字面量常量，而它不会随发版 bump（注释自己写着「package.json 在发布时会 bump」）。实测：一个运行 0.8.13 的实例对外报 0.7.12——第三方集成拿这个字段判版本，读到的是假数据。

修法

复用既有的 PACKAGE_VERSION（src/version-check.js，运行时读 package.json）——宿主侧的 /api/dsh-mneme/status 早就在用它，standalone 面反而是唯一的第二真源。删掉重复常量，/status 与宿主状态页从此同源。

回归锁

test/standalone-api.test.js 原本断言 body.version === "0.7.12"——锁字面量正是漏 bump 没被 CI 拦下的原因：测试只证明「常量和它自己一致」。改为断言等于 PACKAGE_VERSION，版本漂移从此必红。

变异检验：把实现改回字面量，该用例变红（1 fail）；还原后 21/21 绿。全量 npm test 1537 通过 / 0 失败（与双 README 徽章计数一致，无需刷徽章）。

范围

一行实现 + 一条断言改写，不触及其他端点与配置面。附带把文件头注释里的过时版本号 (v0.7.12) 去掉。

Summary by CodeRabbit

• Bug Fixes
  • /status 端点现在返回与当前软件包版本一致的版本号，不再显示过时的固定版本。

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🧰 Additional context used

📚 Code guidelines (1)

AGENTS.md — auto-discovered

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ℹ️ Recent review info

⚙️ Run configuration

• Configuration used: Repository: slow-stack/mneme/.coderabbit.yaml
• Review profile: CHILL
• Plan: Advanced
• Run ID: 3d344447-1cbc-47d2-ab08-deb32c639e19

📥 Commits

Reviewing files that changed from the base of the PR and between b517b11 and edaae5a.

📒 Files selected for processing (4)

• dsh-mneme/CHANGELOG.md
• dsh-mneme/lib/api-standalone.js
• dsh-mneme/src/api-standalone.js
• dsh-mneme/test/standalone-api.test.js

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📝 Walkthrough

Walkthrough

Standalone API 的 /status 响应改为使用 version-check.js 中的 PACKAGE_VERSION。对应测试和变更日志也已更新。

Changes

Standalone API 状态版本号

Layer / File(s)	Summary
状态接口版本来源与验证 dsh-mneme/src/api-standalone.js, dsh-mneme/lib/api-standalone.js, dsh-mneme/test/standalone-api.test.js, dsh-mneme/CHANGELOG.md	/status 的版本值改为 PACKAGE_VERSION。测试改为校验该常量，变更日志记录此调整；文件头注释移除了固定版本标记。

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~8 minutes

Change: Bug fix

Suggested reviewers: heptaspirit

Merge Risk: ⚪ Minimal · up to edaae

The standalone status version now follows package metadata in both source and distributable code. No actionable merge-blocking risk remains.

Architecture Summary

Architecture risk: 🔵 Low · up to edaae

The change affects 1 system.

Changed systems: dsh-mneme

Architecture concerns
No architecture-level concerns identified.

Review details

Systems and components

• observed — dsh-mneme (service) was modified; 4 changed files map to changed impact.

Before / after behavior

• observed — Modified behavior in dsh-mneme/CHANGELOG.md: 新增 standalone API /status 版本号修正记录，说明其版本值现复用 PACKAGE_VERSION，并将测试断言改为锁定该常量，而非硬编码字面量。
• observed — Modified behavior in dsh-mneme/lib/api-standalone.js: 文件头注释移除了固定版本号 (v0.7.12)；其余注释内容未变。
• observed — Modified behavior in dsh-mneme/lib/api-standalone.js: 新增 PACKAGE_VERSION 导入；删除硬编码常量 VERSION = "0.7.12"。默认端口和主机常量保持不变。
• observed — Modified behavior in dsh-mneme/lib/api-standalone.js: /status 响应的 version 值从硬编码的 VERSION 改为导入的 PACKAGE_VERSION。

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	标题准确概括了主要变更：移除硬编码版本号，使 standalone API 的 /status 返回真实包版本。
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 3 files. (1 skipped: 1 …
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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