重构：引入DirectoryService以优化路径解析和项目根目录查找

- 在多个协议实现中（如ProjectProtocol、PackageProtocol等）引入DirectoryService，替换了直接的路径处理逻辑，增强了路径解析的智能性和可靠性。
- 更新了相关方法以支持异步操作，确保在查找项目根目录和注册表路径时能够优雅地处理错误并回退到默认路径。
- 在PromptXConfig中动态计算.promptx目录路径，提升了配置管理的灵活性。

此改动旨在提升代码的可读性和一致性，同时为未来的扩展打下基础。

src/lib/core/resource/discovery/PackageDiscovery.js

@@ -5,6 +5,7 @@ const logger = require('../../../utils/logger')
 const path = require('path')
 const fs = require('fs-extra')
 const CrossPlatformFileScanner = require('./CrossPlatformFileScanner')
+const { getDirectoryService } = require('../../../utils/DirectoryService')
 
 /**
  * PackageDiscovery - 包级资源发现器
@@ -19,7 +20,9 @@ class PackageDiscovery extends BaseDiscovery {
   constructor() {
     super('PACKAGE', 1)
     this.fileScanner = new CrossPlatformFileScanner()
-    this.registryPath = path.join(process.cwd(), 'src/package.registry.json')
+    this.directoryService = getDirectoryService()
+    // 将在_getRegistryPath()中动态计算
+    this.registryPath = null
   }
 
   /**
@@ -78,6 +81,29 @@ class PackageDiscovery extends BaseDiscovery {
     }
   }
 
+  /**
+   * 获取注册表路径
+   * @returns {Promise<string>} 注册表文件路径
+   * @private
+   */
+  async _getRegistryPath() {
+    if (!this.registryPath) {
+      try {
+        const context = {
+          startDir: process.cwd(),
+          platform: process.platform,
+          avoidUserHome: true
+        }
+        const projectRoot = await this.directoryService.getProjectRoot(context)
+        this.registryPath = path.join(projectRoot, 'src/package.registry.json')
+      } catch (error) {
+        // 回退到默认路径
+        this.registryPath = path.join(process.cwd(), 'src/package.registry.json')
+      }
+    }
+    return this.registryPath
+  }
+
   /**
    * 从硬编码注册表加载资源
    * @returns {Promise<RegistryData|null>} 注册表数据
@@ -85,14 +111,15 @@ class PackageDiscovery extends BaseDiscovery {
    */
   async _loadFromRegistry() {
     try {
-      logger.debug(`[PackageDiscovery] 🔧 注册表路径: ${this.registryPath}`)
+      const registryPath = await this._getRegistryPath()
+      logger.debug(`[PackageDiscovery] 🔧 注册表路径: ${registryPath}`)
       
-      if (!(await fs.pathExists(this.registryPath))) {
-        logger.warn(`[PackageDiscovery] ❌ 注册表文件不存在: ${this.registryPath}`)
+      if (!(await fs.pathExists(registryPath))) {
+        logger.warn(`[PackageDiscovery] ❌ 注册表文件不存在: ${registryPath}`)
         return null
       }
 
-      const registryData = await RegistryData.fromFile('package', this.registryPath)
+      const registryData = await RegistryData.fromFile('package', registryPath)
       logger.debug(`[PackageDiscovery] 📊 加载资源总数: ${registryData.size}`)
       
       return registryData
@@ -461,16 +488,22 @@ class PackageDiscovery extends BaseDiscovery {
    * @returns {Promise<boolean>} 是否为开发模式
    */
   async _isDevelopmentMode() {
-    const cwd = process.cwd()
-    const hasCliScript = await fs.pathExists(path.join(cwd, 'src', 'bin', 'promptx.js'))
-    const hasPackageJson = await fs.pathExists(path.join(cwd, 'package.json'))
-    
-    if (!hasCliScript || !hasPackageJson) {
-      return false
-    }
-
     try {
-      const packageJson = await fs.readJSON(path.join(cwd, 'package.json'))
+      const context = {
+        startDir: process.cwd(),
+        platform: process.platform,
+        avoidUserHome: true
+      }
+      const projectRoot = await this.directoryService.getProjectRoot(context)
+      
+      const hasCliScript = await fs.pathExists(path.join(projectRoot, 'src', 'bin', 'promptx.js'))
+      const hasPackageJson = await fs.pathExists(path.join(projectRoot, 'package.json'))
+      
+      if (!hasCliScript || !hasPackageJson) {
+        return false
+      }
+
+      const packageJson = await fs.readJSON(path.join(projectRoot, 'package.json'))
       return packageJson.name === 'dpml-prompt'
     } catch (error) {
       return false