test(presets): lock OpenCode Go direct Anthropic access regression

Port the regression coverage from #6196: the Claude Code preset must keep
ANTHROPIC_API_KEY (the Go gateway's /messages endpoint only accepts
x-api-key and silently ignores Bearer), must not reintroduce
ANTHROPIC_AUTH_TOKEN, and must not require local routing. The apiFormat
assertion is adapted to the shape 16cc0d7f landed on main: native
Anthropic presets omit the field entirely.

Co-authored-by: YUZHEthefool <2804776511@qq.com>
Co-authored-by: allenxu09 <s23372.xu@stu.scie.com.cn>

tests/config/claudeProviderPresets.test.ts

@@ -1,5 +1,7 @@
 import { describe, expect, it } from "vitest";
 import { providerPresets } from "@/config/claudeProviderPresets";
+import type { Provider } from "@/types";
+import { providerNeedsRouting } from "@/utils/providerCapabilities";
 
 describe("Kimi For Coding Provider Preset", () => {
   const kimiForCoding = providerPresets.find(
@@ -47,6 +49,44 @@ describe("Codex Provider Preset", () => {
   });
 });
 
+describe("OpenCode Go Provider Preset", () => {
+  const openCodeGo = providerPresets.find((p) => p.name === "OpenCode Go");
+
+  it("should use the Go Anthropic compatibility endpoint with x-api-key auth", () => {
+    expect(openCodeGo).toBeDefined();
+
+    const env = (openCodeGo!.settingsConfig as any).env;
+    expect(env).toMatchObject({
+      ANTHROPIC_BASE_URL: "https://opencode.ai/zen/go",
+      ANTHROPIC_API_KEY: "",
+      ANTHROPIC_MODEL: "deepseek-v4-flash",
+      ANTHROPIC_DEFAULT_HAIKU_MODEL: "deepseek-v4-flash",
+      ANTHROPIC_DEFAULT_SONNET_MODEL: "deepseek-v4-flash",
+      ANTHROPIC_DEFAULT_OPUS_MODEL: "deepseek-v4-flash",
+    });
+    // /messages 只认 x-api-key，Bearer 被网关静默忽略——勿换回 AUTH_TOKEN
+    expect(env).not.toHaveProperty("ANTHROPIC_AUTH_TOKEN");
+    // 原生 anthropic 直连的预设不写 apiFormat（缺省即免路由）
+    expect(openCodeGo!.apiFormat).toBeUndefined();
+    expect(openCodeGo!.apiKeyField).toBe("ANTHROPIC_API_KEY");
+  });
+
+  it("should not require local routing in Claude Code", () => {
+    const provider: Provider = {
+      id: "opencode-go",
+      name: openCodeGo!.name,
+      category: openCodeGo!.category,
+      settingsConfig: openCodeGo!.settingsConfig as Record<string, any>,
+      meta: {
+        apiFormat: openCodeGo!.apiFormat,
+        apiKeyField: openCodeGo!.apiKeyField,
+      },
+    };
+
+    expect(providerNeedsRouting("claude", provider)).toBe(false);
+  });
+});
+
 describe("AWS Bedrock Provider Presets", () => {
   const bedrockAksk = providerPresets.find(
     (p) => p.name === "AWS Bedrock (AKSK)",