Add transparent portrait avatars for market digital employees (#202)

The catalog previously showed opaque icons or text fallbacks for the
seven digital employees, and source-pointer installs could still get
different avatars. This updates every catalog card to a 512×512
transparent portrait, bumps the listed releases, and pins the six source
repositories to commits that include the matching AgentFS avatar.

Validation: `validate_catalog_metadata.py --require-complete` (0
errors), `validate-i18n.py` (0 errors), and `translate.py --check`. All
seven WebP files have an alpha channel with fully transparent pixels and
are below 50 KB each.

agents/dingtalk-workspace/entry.json

@@ -19,7 +19,7 @@
       "shortDesc": "A DingTalk workspace entry point that turns natural-language intent into correct official dws CLI calls. Requires separately installing the third-party dingtalk-workspace-cli and completing DingTalk account OAuth."
     }
   },
-  "latestVersion": "1.0.0",
+  "latestVersion": "1.0.1",
   "maintainer": {
     "name": "DesireCore Official",
     "verified": true
@@ -29,12 +29,15 @@
   "redistribution": "source-pointer-only",
   "avatar": {
     "t": "钉",
-    "bg": "linear-gradient(135deg, #3D9BFF, #0047B3)"
+    "bg": "linear-gradient(135deg, #3D9BFF, #0047B3)",
+    "image": {
+      "path": "assets/avatar.webp"
+    }
   },
   "source": {
     "kind": "git",
     "repoUrl": "https://github.com/desirecore-agent/dingtalk-workspace.git",
     "repoBranch": "main",
-    "ref": "9e5a4695b07d9d71921202a7a4072140c2135670"
+    "ref": "746d011a64db4061a68e512f3e5aaa4c0ec5abe5"
   }
 }