docs(readme): dedupe kimi-k2.7-code in designer range (#823)

README.md

@@ -473,7 +473,7 @@ If any agent fails to respond, check your provider authentication and config fil
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-      <b>Recommended Models:</b> <code>gemini-3.5-flash</code> <code>kimi-k2.7-code</code> <code>kimi-k2.7-code</code> <code>minimax-m3</code>
+      <b>Recommended Models:</b> <code>gemini-3.5-flash</code> <code>kimi-k2.7-code</code> <code>minimax-m3</code>
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