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/deploy/console.yaml

@@ -55,7 +55,7 @@ spec:
       serviceAccountName: fission-console
       containers:
         - name: console
-          image: naeel/fission-console:v1.3.79
+          image: naeel/fission-console:v1.3.80
           imagePullPolicy: Always
           ports:
             - containerPort: 8090