build(desktop): 打包 MCP Skill 并保留输出目录选择

- PyInstaller 打包时加入 wechat-mcp-copilot Skill 资源
- 使用跨平台 add-data 分隔符生成参数
- 安装/更新时若用户已迁移输出目录，则跳过默认目录迁移提示

Author: 2977094657

desktop/scripts/build-backend.cjs

@@ -55,8 +55,12 @@ VSVersionInfo(
 `;
 }
 
+function pyInstallerAddData(sourcePath, targetPath) {
+  return `${sourcePath}${path.delimiter}${targetPath}`;
+}
+
 const nativeDir = path.join(repoRoot, "src", "wechat_decrypt_tool", "native");
-const addData = `${nativeDir};wechat_decrypt_tool/native`;
+const skillDir = path.join(repoRoot, "skills", "wechat-mcp-copilot");
 const projectToml = path.join(repoRoot, "pyproject.toml");
 
 const desktopPackageJsonPath = path.join(repoRoot, "desktop", "package.json");
@@ -88,7 +92,9 @@ const args = [
   "--version-file",
   versionFilePath,
   "--add-data",
-  addData,
+  pyInstallerAddData(nativeDir, "wechat_decrypt_tool/native"),
+  "--add-data",
+  pyInstallerAddData(skillDir, "skills/wechat-mcp-copilot"),
   entry,
 ];
 

desktop/scripts/installer-custom.nsh

@@ -148,6 +148,13 @@ FunctionEnd
 Function WDA_OutputDirPageCreate
   Call WDA_InitOutputDirSelection
 
+  ; If the user already moved output away from the default AppData location,
+  ; keep that choice silently on install/update. Only show this migration prompt
+  ; while the effective output directory is still the default.
+  ${If} $WDA_SelectedOutputDir != "${WDA_DEFAULT_OUTPUT_DIR}"
+    Abort
+  ${EndIf}
+
   nsDialogs::Create 1018
   Pop $WDA_OutputDirPage