fix: isUsing3PServices 检查所有非 Anthropic provider (#1235)

原实现仅检查 Bedrock/Vertex/Foundry，遗漏了 OpenAI、Gemini、Grok
三个通过 CLAUDE_CODE_USE_* 环境变量切换的第三方 provider。

这导致：
- 命令可用性判定中 OpenAI/Gemini/Grok 用户被错误识别为 console 用户
  （/fast、/install-github-app 两个 Anthropic 专有命令误显示）
- auth status 显示中这些用户被误报为"未登录"

Co-authored-by: deepseek-v4-pro[1m] <deepseek-ai@claude-code-best.win>

src/utils/auth.ts

@@ -1724,12 +1724,29 @@ export function getSubscriptionName(): string {
   }
 }
 
-/** Check if using third-party services (Bedrock or Vertex or Foundry) */
+/**
+ * Check if using third-party services (non-Anthropic providers).
+ *
+ * This function gates several behaviours that should only apply when the user
+ * is NOT calling the first-party Anthropic API directly:
+ *  - auth status display (authStatus handler)
+ *  - command visibility (login/logout shown for non-3P)
+ *  - command availability checks (meetsAvailabilityRequirement)
+ *
+ * KEEP IN SYNC with providers.ts — when a new CLAUDE_CODE_USE_* env var is
+ * added to getAPIProvider(), the corresponding check MUST be added here.
+ * Providers whose selection is controlled purely via settings.modelType
+ * (rather than env vars) are NOT covered by this function and may need
+ * separate handling in the call sites above.
+ */
 export function isUsing3PServices(): boolean {
   return !!(
     isEnvTruthy(process.env.CLAUDE_CODE_USE_BEDROCK) ||
     isEnvTruthy(process.env.CLAUDE_CODE_USE_VERTEX) ||
-    isEnvTruthy(process.env.CLAUDE_CODE_USE_FOUNDRY)
+    isEnvTruthy(process.env.CLAUDE_CODE_USE_FOUNDRY) ||
+    isEnvTruthy(process.env.CLAUDE_CODE_USE_OPENAI) ||
+    isEnvTruthy(process.env.CLAUDE_CODE_USE_GEMINI) ||
+    isEnvTruthy(process.env.CLAUDE_CODE_USE_GROK)
   )
 }