feat(channels): 更新渠道类型标签以更清晰描述

frontend/src/pages/Channels.tsx

@@ -41,9 +41,9 @@ const channelTypes = [
   { value: "openai", label: "OpenAI" },
   { value: "openai-responses", label: "OpenAI Responses" },
   { value: "claude", label: "Claude" },
+  { value: "claude-to-openai", label: "Claude via OpenAI" },
   { value: "gemini", label: "Gemini" },
   { value: "openai-audio", label: "OpenAI Audio" },
-  { value: "claude-to-openai", label: "Claude → OpenAI" },
   { value: "azure-openai", label: "Azure OpenAI" },
   { value: "azure-openai-audio", label: "Azure OpenAI Audio" },
   { value: "azure-openai-responses", label: "Azure OpenAI Responses" },