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/workflow/SKILL.md

@@ -38,7 +38,7 @@ metadata:
         Guides the Agent to design, edit, test, and execute Workflow workflows. Use when the user asks to create a workflow, orchestrate multi-step automation, design an approval pipeline, or turn repetitive multi-node tasks into a reusable DSL.
       body: ./SKILL.md
       source_hash: sha256:aa197c62ae8a33d7
-      translated_by: ai:claude-opus-4-7
+      translated_by: human
       translated_at: '2026-05-04'
 market:
   icon: >-
@@ -147,7 +147,7 @@ workflow is a **Procedural Skill** that empowers the Agent to orchestrate multi-
 **DSL file location**:
 
 ```
-~/.desirecore/workflows/<wf_id>/workflow.dsl.yaml
+${DESIRECORE_ROOT}/workflows/<wf_id>/workflow.dsl.yaml
 ```
 
 Where `wf_id` uses a `wf_` prefix + snake_case, e.g. `wf_legal_review`, `wf_daily_report`.
@@ -539,7 +539,7 @@ All dynamic values in the DSL are uniformly referenced using the `{{}}` template
 
 A workflow can reference user-preconfigured secrets via `{{secrets.keyName}}` for scenarios such as API calls.
 
-- Secrets are preconfigured by the user in `~/.desirecore/config/secrets.json`
+- Secrets are preconfigured by the user in `${DESIRECORE_ROOT}/config/secrets.json`
 - The engine automatically resolves `{{secrets.*}}` at runtime, replacing them with the actual values
 - Secrets are resolved only during the execution phase; their actual values are not exposed during validation or dry-run
 
@@ -563,7 +563,7 @@ Use the `WorkflowValidate` tool to validate the structure and reference integrit
 ```
 Tool: WorkflowValidate
 Parameters:
-  path: ~/.desirecore/workflows/<wf_id>/workflow.dsl.yaml
+  path: ${DESIRECORE_ROOT}/workflows/<wf_id>/workflow.dsl.yaml
 ```
 
 **What is validated**:
@@ -587,7 +587,7 @@ Use the `WorkflowTest` tool to perform a simulated execution (dry-run) without a
 ```
 Tool: WorkflowTest
 Parameters:
-  path: ~/.desirecore/workflows/<wf_id>/workflow.dsl.yaml
+  path: ${DESIRECORE_ROOT}/workflows/<wf_id>/workflow.dsl.yaml
   params:                      # Optional, used to simulate trigger parameters
     filePath: /path/to/input.md
 ```
@@ -610,7 +610,7 @@ Use the `WorkflowRun` tool to start the workflow.
 ```
 Tool: WorkflowRun
 Parameters:
-  path: ~/.desirecore/workflows/<wf_id>/workflow.dsl.yaml
+  path: ${DESIRECORE_ROOT}/workflows/<wf_id>/workflow.dsl.yaml
   params:                      # Optional, passed in as the {{trigger.key}} context
     filePath: /path/to/input.md
 ```