fix: replace hardcoded ~/.desirecore paths with ${DESIRECORE_ROOT} variable (#16)

## Summary

- 将所有技能文件中的硬编码 `~/.desirecore/` 和 `$HOME/.desirecore/` 路径替换为
`${DESIRECORE_ROOT}/` 变量
- 递增 manifest.json version 至 1.2.1

## Why

dev 模式下 `DESIRECORE_HOME=~/.desirecore-dev`，硬编码路径导致技能读取错误的端口文件和目录。主仓库的
`variable-substitutor.ts` 会在运行时将 `${DESIRECORE_ROOT}` 替换为实际根目录。

## Test plan

- [ ] `npm run dev` 启动后触发任意技能，确认端口路径解析为
`~/.desirecore-dev/agent-service.port`
- [ ] prod 模式确认路径为 `~/.desirecore/agent-service.port`

🤖 Generated with [Claude Code](https://claude.com/claude-code)

skills/dev-environment-setup/SKILL.md

@@ -49,7 +49,7 @@ metadata:
         Use this skill as a router/index when the user faces a development environment question that spans multiple domains: containers (Docker/Podman), WSL2 on Windows, office-skill dependencies (DOCX/PDF/XLSX/ PPTX), or system tools (LibreOffice/Poppler/Pandoc/Tesseract). For pure Python issues use python-runtime skill; for pure Node.js issues use nodejs-runtime skill. Triggers include: "setup environment", "PATH", "WSL", "WSL2", "docker not found", "podman", "container", "office dependency", "LibreOffice", "poppler", "pandoc", "tesseract", or any cross-cutting environment question. Use when the user mentions environment setup, PATH, containers, Docker, Podman, WSL, WSL2, office dependencies, system tools, or needs an entry-point guide when uncertain whether the issue belongs to Python or Node.js.
       body: ./SKILL.md
       source_hash: sha256:7e4baaf42d5c0ace
-      translated_by: ai:claude-opus-4-7
+      translated_by: human
       translated_at: '2026-05-03'
 market:
   icon: >-
@@ -146,7 +146,7 @@ DesireCore embeds Hatch (Python) and Volta (Node.js), providing complete environ
 ## Important Constraints
 
 1. **Do not write strong keywords like python / node / pip / npm into this skill's description**—those belong to their respective sub-skills, to avoid trigger conflicts.
-2. **API first**: `scripts/probe.sh` first checks `~/.desirecore/agent-service.port`; if it exists, recommend the HTTP API path.
+2. **API first**: `scripts/probe.sh` first checks `${DESIRECORE_ROOT}/agent-service.port`; if it exists, recommend the HTTP API path.
 3. **Cache coherence**: after any install/uninstall completes, call `POST /api/runtime/environment/refresh` to invalidate the cache before issuing subsequent GETs.
 4. **Cross-platform**: every command template provides both macOS / Linux and Windows (PowerShell) versions.