feat(presets): add OpenCode Zen for Claude Code and Codex

OpenCode Zen is the pay-as-you-go side of the same workspace key that
OpenCode Go uses, so both now sit in one "OpenCode" family row (Go as the
coding subscription, Zen as pay-as-you-go).

Both presets connect directly without local routing: Claude Code talks to
Zen's native /v1/messages with ANTHROPIC_API_KEY (the endpoint only reads
x-api-key), and Codex talks to /v1/responses. Codex defaults to gpt-6-sol
because Zen currently returns 403 "Model access is disabled" for
gpt-5.6-sol. Free Zen models are rejected outside OpenCode, so no preset
defaults to them. OpenCode and Pi already ship Zen as a built-in provider
and get no preset.

Closes #6016

src/config/claudeProviderPresets.ts

@@ -1074,6 +1074,8 @@ export const providerPresets: ProviderPreset[] = [
   },
   {
     name: "OpenCode Go",
+    family: "opencode",
+    planKey: "coding",
     websiteUrl: "https://opencode.ai/go",
     apiKeyUrl: "https://opencode.ai/go?ref=2YTRG2NGTX",
     partnerPromotionKey: "opencode_go",
@@ -1097,6 +1099,31 @@ export const providerPresets: ProviderPreset[] = [
     icon: "opencode",
     iconColor: "#211E1E",
   },
+  {
+    // Zen 按量网关：Claude 模型原生走 /v1/messages，直连不需要路由。
+    // 和 Go 一样只认 x-api-key（Bearer 报 Missing API key）。
+    // 免费模型只能在 OpenCode 里用（外部调用 403 FreeTierError），默认不用。
+    name: "OpenCode Zen",
+    family: "opencode",
+    planKey: "payg",
+    websiteUrl: "https://opencode.ai/zen",
+    apiKeyUrl: "https://opencode.ai/auth",
+    apiKeyField: "ANTHROPIC_API_KEY",
+    settingsConfig: {
+      env: {
+        ANTHROPIC_BASE_URL: "https://opencode.ai/zen",
+        ANTHROPIC_API_KEY: "",
+        ANTHROPIC_MODEL: "claude-sonnet-5-5",
+        ANTHROPIC_DEFAULT_HAIKU_MODEL: "claude-haiku-4-5",
+        ANTHROPIC_DEFAULT_SONNET_MODEL: "claude-sonnet-5-5",
+        ANTHROPIC_DEFAULT_OPUS_MODEL: "claude-opus-5-5",
+      },
+    },
+    category: "aggregator",
+    endpointCandidates: ["https://opencode.ai/zen"],
+    icon: "opencode",
+    iconColor: "#211E1E",
+  },
   {
     // 腾讯云 Token Plan 个人版（1823/130060，2026-08-21 版）：通用 + Hy 两
     // 系列共用同一端点与 API Key；Auto 智能路由的调用 ID 是 tc-code-latest。

src/config/codexProviderPresets.ts

@@ -3260,6 +3260,8 @@ requires_openai_auth = true`,
   },
   {
     name: "OpenCode Go",
+    family: "opencode",
+    planKey: "coding",
     websiteUrl: "https://opencode.ai/go",
     apiKeyUrl: "https://opencode.ai/go?ref=2YTRG2NGTX",
     partnerPromotionKey: "opencode_go",
@@ -3331,6 +3333,27 @@ requires_openai_auth = true`,
     icon: "opencode",
     iconColor: "#211E1E",
   },
+  {
+    // Zen 按量网关：GPT 模型原生走 /v1/responses，直连不需要路由；
+    // 免费模型只能在 OpenCode 里用（外部调用 403 FreeTierError），默认不用。
+    // 默认不用全仓通用的 gpt-5.6-sol：Zen 上游对它返回 403「Model access is
+    // disabled」（2026-10-06 真 Key 实测），gpt-6-sol 经 Codex 跑通工具调用。
+    name: "OpenCode Zen",
+    family: "opencode",
+    planKey: "payg",
+    websiteUrl: "https://opencode.ai/zen",
+    apiKeyUrl: "https://opencode.ai/auth",
+    auth: generateThirdPartyAuth(""),
+    config: generateThirdPartyConfig(
+      "opencode_zen",
+      "https://opencode.ai/zen/v1",
+      "gpt-6-sol",
+    ),
+    endpointCandidates: ["https://opencode.ai/zen/v1"],
+    category: "aggregator",
+    icon: "opencode",
+    iconColor: "#211E1E",
+  },
   {
     name: "AiHubMix",
     websiteUrl: "https://aihubmix.com",

src/config/presetFamilies.ts

@@ -26,6 +26,11 @@ export const PRESET_FAMILIES = {
     planOrder: ["payg", "coding"],
   },
   minimax: { name: "MiniMax" },
+  // Go 是编程订阅、Zen 是按量付费，同一个工作区 Key
+  opencode: {
+    name: "OpenCode",
+    planOrder: ["coding", "payg"],
+  },
   qianwen: { name: "千问AI平台" },
   qwencloud: { name: "QwenCloud" },
   siliconflow: { name: "SiliconFlow" },

tests/config/claudeProviderPresets.test.ts

@@ -87,6 +87,31 @@ describe("OpenCode Go Provider Preset", () => {
   });
 });
 
+describe("OpenCode Zen Provider Preset", () => {
+  const openCodeZen = providerPresets.find((p) => p.name === "OpenCode Zen");
+
+  it("should connect Claude models to Zen /messages directly with x-api-key auth", () => {
+    expect(openCodeZen).toBeDefined();
+    expect(openCodeZen!.family).toBe("opencode");
+
+    const env = (openCodeZen!.settingsConfig as any).env;
+    expect(env.ANTHROPIC_BASE_URL).toBe("https://opencode.ai/zen");
+    // 和 Go 同一套网关：/messages 只认 x-api-key
+    expect(env).not.toHaveProperty("ANTHROPIC_AUTH_TOKEN");
+    expect(openCodeZen!.apiKeyField).toBe("ANTHROPIC_API_KEY");
+    expect(openCodeZen!.apiFormat).toBeUndefined();
+    // 免费模型外部调用会被 403，默认模型不能是 *-free / big-pickle
+    for (const key of [
+      "ANTHROPIC_MODEL",
+      "ANTHROPIC_DEFAULT_HAIKU_MODEL",
+      "ANTHROPIC_DEFAULT_SONNET_MODEL",
+      "ANTHROPIC_DEFAULT_OPUS_MODEL",
+    ]) {
+      expect(env[key]).toMatch(/^claude-/);
+    }
+  });
+});
+
 describe("AWS Bedrock Provider Presets", () => {
   const bedrockAksk = providerPresets.find(
     (p) => p.name === "AWS Bedrock (AKSK)",