feat(icons): add ciphermail (#1172)

Co-authored-by: Dashboard Icons Manager <193821040+dashboard-icons-manager[bot]@users.noreply.github.com>

tree.json

@@ -277,6 +277,7 @@
         "cilium.png",
         "cinny-light.png",
         "cinny.png",
+        "ciphermail.png",
         "cisco.png",
         "clash.png",
         "claude-ai-light.png",
@@ -2419,6 +2420,7 @@
         "cilium.svg",
         "cinny-light.svg",
         "cinny.svg",
+        "ciphermail.svg",
         "cisco.svg",
         "claude-ai-light.svg",
         "claude-ai.svg",
@@ -4258,6 +4260,7 @@
         "cilium.webp",
         "cinny-light.webp",
         "cinny.webp",
+        "ciphermail.webp",
         "cisco.webp",
         "clash.webp",
         "claude-ai-light.webp",