feat(claude): route OpenCode Go preset directly to /messages

/v1/messages only accepts x-api-key: switch env from ANTHROPIC_AUTH_TOKEN to ANTHROPIC_API_KEY and add top-level apiKeyField.
Drop apiFormat so Claude Code connects directly (providerNeedsRouting no longer triggers) instead of through the proxy.
Desktop keeps mode: proxy (it cannot rename models itself) but switches to anthropic passthrough.

src/config/claudeDesktopProviderPresets.ts

@@ -831,7 +831,9 @@ export const claudeDesktopProviderPresets: ClaudeDesktopProviderPreset[] = [
     category: "third_party",
     baseUrl: "https://opencode.ai/zen/go",
     mode: "proxy",
-    apiFormat: "openai_chat",
+    // Go 网关 /messages 收除 grok-4.5 外全部模型（Chat 组靠服务端转换），
+    // anthropic 透传即可；上游只认 x-api-key，apiKey 直填默认即该头。
+    apiFormat: "anthropic",
     modelRoutes: brandedRoutes(
       "deepseek-v4-flash",
       "deepseek-v4-flash",

src/config/claudeProviderPresets.ts

@@ -832,10 +832,15 @@ export const providerPresets: ProviderPreset[] = [
     websiteUrl: "https://opencode.ai/go",
     apiKeyUrl: "https://opencode.ai/go?ref=2YTRG2NGTX",
     partnerPromotionKey: "opencode_go",
+    // Go 网关 /v1/messages 只认 x-api-key（Bearer 被静默忽略），
+    // 必须用 ANTHROPIC_API_KEY，不能换回 ANTHROPIC_AUTH_TOKEN。
+    // 直连 Anthropic 端点可用除 grok-4.5 外的全部 Go 模型；
+    // Chat 组模型（DeepSeek/GLM/Kimi 等）依赖网关服务端格式转换（未见文档承诺）。
+    apiKeyField: "ANTHROPIC_API_KEY",
     settingsConfig: {
       env: {
         ANTHROPIC_BASE_URL: "https://opencode.ai/zen/go",
-        ANTHROPIC_AUTH_TOKEN: "",
+        ANTHROPIC_API_KEY: "",
         ANTHROPIC_MODEL: "deepseek-v4-flash",
         ANTHROPIC_DEFAULT_HAIKU_MODEL: "deepseek-v4-flash",
         ANTHROPIC_DEFAULT_SONNET_MODEL: "deepseek-v4-flash",
@@ -843,7 +848,6 @@ export const providerPresets: ProviderPreset[] = [
       },
     },
     category: "third_party",
-    apiFormat: "openai_chat",
     endpointCandidates: ["https://opencode.ai/zen/go"],
     icon: "opencode",
     iconColor: "#211E1E",