feat(files): New → Clone repository clones into the open folder

The File Explorer's New menu (and its right-click menu) gains Clone
repository: it clones a URL into the folder it has open — of the user's own
home or of a workspace's own folder — through POST /api/lanes/clone with
that folder as `parent`, so the URL allowlist, the own-folder check and the
folder account's own git identity all apply, and opens a workspace on the
clone. ECREDENTIALS asks for a login, ESSHAUTH points to Settings → Git.
GET /api/homes now gives `me` its absolute `dir`. Keys typed in the dialog
never reach the explorer's shortcuts (Backspace / Delete).

client/src/i18n/locales/en/lanes.json

@@ -552,6 +552,9 @@
   "fx.refresh": "Refresh",
   "fx.newFolder": "New folder",
   "fx.newFile": "New file",
+  "fx.cloneRepo": "Clone repository",
+  "fx.cloneSubmit": "Clone",
+  "fx.cloned": "Cloned into {{path}} — opened as workspace “{{workspace}}”.",
   "fx.uploadFiles": "Upload files",
   "fx.uploadFolder": "Upload a folder",
   "fx.download": "Download",

client/src/i18n/locales/vi/lanes.json

@@ -552,6 +552,9 @@
   "fx.refresh": "Làm mới",
   "fx.newFolder": "Thư mục mới",
   "fx.newFile": "File mới",
+  "fx.cloneRepo": "Clone repository",
+  "fx.cloneSubmit": "Clone",
+  "fx.cloned": "Đã clone vào {{path}} — đã mở thành workspace “{{workspace}}”.",
   "fx.uploadFiles": "Tải file lên",
   "fx.uploadFolder": "Tải cả thư mục lên",
   "fx.download": "Tải về",