fix(opencode): PlatformTypeBadge no longer falls back to Gemini label

PlatformTypeBadge defaulted unknown platforms to 'Gemini', so opencode
accounts rendered as Gemini in the admin account list. Add explicit
opencode label (OpenCode Go) + teal badge class; also add opencode to
platformColors.platformLabel and ProxiesView probe-target label.

Author: luohui1

frontend/src/components/common/PlatformTypeBadge.vue

@@ -90,6 +90,7 @@ const platformLabel = computed(() => {
   if (props.platform === 'openai') return 'OpenAI'
   if (props.platform === 'antigravity') return 'Antigravity'
   if (props.platform === 'grok') return 'Grok'
+  if (props.platform === 'opencode') return 'OpenCode Go'
   return 'Gemini'
 })
 
@@ -180,6 +181,9 @@ const platformClass = computed(() => {
   if (props.platform === 'grok') {
     return 'bg-zinc-100 text-zinc-700 dark:bg-zinc-800 dark:text-zinc-300'
   }
+  if (props.platform === 'opencode') {
+    return 'bg-teal-100 text-teal-700 dark:bg-teal-900/30 dark:text-teal-400'
+  }
   return 'bg-blue-100 text-blue-700 dark:bg-blue-900/30 dark:text-blue-400'
 })
 

frontend/src/utils/platformColors.ts

@@ -226,8 +226,9 @@ export function platformLabel(p: string): string {
     case 'openai': return 'OpenAI'
     case 'antigravity': return 'Antigravity'
     case 'gemini': return 'Gemini'
-    case 'grok': return 'Grok'
-    case 'composite': return 'Composite'
+      case 'grok': return 'Grok'
+      case 'opencode': return 'OpenCode Go'
+      case 'composite': return 'Composite'
     default: return p || 'API'
   }
 }

frontend/src/views/admin/ProxiesView.vue

@@ -1777,10 +1777,12 @@ const qualityTargetLabel = (target: string) => {
       return 'Anthropic'
     case 'gemini':
       return 'Gemini'
-    case 'grok':
-      return 'Grok'
-    default:
-      return target
+      case 'grok':
+        return 'Grok'
+      case 'opencode':
+        return 'OpenCode Go'
+      default:
+        return target
   }
 }