refactor(architecture): remove unused pair programming files #257

Delete unused files related to pair programming and clean up LayeredArchProvider.
Remove deprecated EP_NAME from companion object.

Author: phodal

core/src/main/kotlin/cc/unitmesh/devti/gui/pair/AutoDevPairToolWindow.kt

@@ -9,7 +9,6 @@ interface LayeredArchProvider {
     fun getLayeredArch(project: Project): ProjectPackageTree
 
     companion object {
-
         private val EP_NAME = ExtensionPointName<LayeredArchProvider>("cc.unitmesh.layeredArchProvider")
 
         fun find(project: Project): LayeredArchProvider? {