feat(icons): add librechat (#1256)

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

tree.json

@@ -995,6 +995,7 @@
         "lemmy.png",
         "lemonldap-ng.png",
         "lets-encrypt.png",
+        "librechat.png",
         "libreddit-light.png",
         "libreddit.png",
         "libremdb.png",
@@ -3048,6 +3049,7 @@
         "lemmy-light.svg",
         "lemmy.svg",
         "lets-encrypt.svg",
+        "librechat.svg",
         "libreddit-light.svg",
         "libreddit.svg",
         "librenms.svg",
@@ -5025,6 +5027,7 @@
         "lemmy.webp",
         "lemonldap-ng.webp",
         "lets-encrypt.webp",
+        "librechat.webp",
         "libreddit-light.webp",
         "libreddit.webp",
         "libremdb.webp",