fix(UI-Overhaul-Phase1): 7 Bugs behoben

1.1 Contacts refresh: useUnifiedContacts mutations already invalidate (verified)
1.2 Contacts drag-drop: ContactList items already draggable + ContactFolderTree onDrop (verified)
1.3 Contacts move dialog: Added move-to-folder dropdown in ContactDetail
1.4 Wiki save refresh: Added refreshKey prop to WikiBrowser, triggers reload after save/delete
1.5 Calendar dialog close: Window.tsx now injects windowId into componentProps
1.6 Communication AI chat: Added metadata support to ConversationCreate schema + service,
    frontend passes conversation_type metadata for AI/system chats,
    categorization checks metadata first
1.7 Wiki duplicate menu: Removed hardcoded /wiki from Sidebar.tsx (plugin provides it dynamically)

Backend: kommunikation schema/routes/services updated for metadata support
Frontend: tsc clean, build successful

frontend/src/components/window/Window.tsx

@@ -154,7 +154,7 @@ export function Window({ window: win }: WindowProps) {
             win.aiChatVisible && 'border-r border-secondary-200'
           )}
         >
-          <ContentComponent {...win.componentProps} />
+          <ContentComponent {...win.componentProps} windowId={win.id} />
         </div>
 
         {/* AI Chat Panel */}