feat: add new lock-key icon for better visual clarity

Introduced a new 'lock-key' SVG icon to improve representation of the lock feature in the UI. Updated services.json to reference the new icon, replacing the old 'lock' icon reference. This enhances clarity and user experience by providing a more intuitive graphic.

assets/dist/icons/lock-key.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="32" height="32" fill="#000000" viewBox="0 0 256 256"><path d="M128,112a28,28,0,0,0-8,54.83V184a8,8,0,0,0,16,0V166.83A28,28,0,0,0,128,112Zm0,40a12,12,0,1,1,12-12A12,12,0,0,1,128,152Zm80-72H176V56a48,48,0,0,0-96,0V80H48A16,16,0,0,0,32,96V208a16,16,0,0,0,16,16H208a16,16,0,0,0,16-16V96A16,16,0,0,0,208,80ZM96,56a32,32,0,0,1,64,0V80H96ZM208,208H48V96H208V208Z"></path></svg>

data/services.json

@@ -224,7 +224,7 @@
                     "url": "https://ots.private.coffee"
                 }
             ],
-            "icon": "lock",
+            "icon": "lock-key",
             "exclude_from_index": false,
             "exclude_from_simple": false
         },