feat: clone function — POST /functions/:name/clone (v1.3.80)

- Backend: function_clone.go — copies archive from storagesvc, creates
  new Package/Function/HTTPTrigger preserving all settings (env vars,
  timeout, entrypoint, executor type, podspec)
- Backend: route handlers.go — /functions/:name/clone POST
- Frontend: 'Клон' button in edit modal, inline name input form
- Frontend: JS toggleCloneArea/submitClone with validation
- Pre-fills clone name as '<original>-copy', validates format

console/internal/api/handlers.go

@@ -139,6 +139,12 @@ func (s *Server) handleFunctionsAction(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	// /functions/:name/clone — клонировать функцию с новым именем
+	if len(parts) == 2 && parts[1] == "clone" && r.Method == http.MethodPost {
+		s.handleCloneFunction(w, r, name)
+		return
+	}
+
 	http.NotFound(w, r)
 }