Add openclaw to platforms list (#308)

OpenClaw (https://openclaw.ai) is an open-source agent gateway that
runs Claude as its primary backend. This skill works out-of-the-box
inside OpenClaw agents — same SKILL.md + python3 search.py invocation
pattern as the other supported platforms. Adding it to the list so
the install flow can target it.

Co-authored-by: yinhaoti <yinhaoti@macmini.home>

skill.json

@@ -35,7 +35,8 @@
     "droid",
     "warp",
     "augment",
-    "antigravity"
+    "antigravity",
+    "openclaw"
   ],
   "install": "npx uipro-cli init --ai {{platform}}"
 }