fix: update frontend default model references from DeepSeek to GLM

Backend was changed to GLM-5 in 8a0f3f5 but frontend still had
hardcoded DeepSeek fallback and onboarding copy.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

web/src/components/trader/ModelConfigModal.tsx

@@ -536,7 +536,7 @@ function Claw402ConfigForm({
         </div>
         <div className="grid grid-cols-2 sm:grid-cols-3 gap-2">
           {CLAW402_MODELS.map((m) => {
-            const isSelected = (modelName || 'deepseek') === m.id
+            const isSelected = (modelName || 'glm-5') === m.id
             return (
               <button
                 key={m.id}