Snippets: add built-in templates (collapsed "Templates" section in the snippets view and the terminal snippet panel): authorize an SSH key from the keychain for a user, install the QEMU guest agent, set/remove an APT cache server (apt-cacher-ng), system update; parameters are asked for before running

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

package.json

@@ -1,7 +1,7 @@
 {
   "name": "mrterm",
   "productName": "MrTerm",
-  "version": "0.13.3",
+  "version": "0.14.0",
   "description": "Moderner SSH-, SFTP- und RDP-Client",
   "main": "src/main/main.js",
   "author": "MrBlake",