Feat/mcp oauth (#4837)

* feat: implement OAuth client provider and lockfile management

* feat: implement OAuth callback server and refactor authentication flow

* fix(McpService): restrict command handling to 'npx' for improved clarity

* refactor: make callbackPort optional in OAuthProviderOptions and clean up MCPService

* refactor: restructure OAuth handling by creating separate callback and provider classes, and remove unused utility functions

src/main/utils/file.ts

@@ -79,3 +79,7 @@ export function getFilesDir() {
 export function getConfigDir() {
   return path.join(os.homedir(), '.cherrystudio', 'config')
 }
+
+export function getAppConfigDir(name: string) {
+  return path.join(getConfigDir(), name)
+}