feat(presets): add OpenCode Go subscription preset for Codex and OpenCode

Add OpenCode Go (opencode.ai/zen/go) provider presets across clients:

- Codex: openai_chat conversion with model catalog (GLM/Kimi/DeepSeek/MiMo), no static codexChatReasoning so per-model capability is inferred

- OpenCode: @ai-sdk/openai-compatible against /zen/go/v1

- Claude: add apiKeyUrl (opencode.ai/auth) and align websiteUrl to /go

Auth is a plain pasteable API key (no OAuth). Go splits wire format by model: OpenAI /chat/completions for GLM/Kimi/DeepSeek/MiMo, Anthropic /messages for MiniMax/Qwen; these presets target the chat-format models.

src/config/opencodeProviderPresets.ts

@@ -1046,6 +1046,37 @@ export const opencodeProviderPresets: OpenCodeProviderPreset[] = [
     },
   },
 
+  {
+    name: "OpenCode Go",
+    websiteUrl: "https://opencode.ai/go",
+    apiKeyUrl: "https://opencode.ai/auth",
+    settingsConfig: {
+      npm: "@ai-sdk/openai-compatible",
+      name: "OpenCode Go",
+      options: {
+        baseURL: "https://opencode.ai/zen/go/v1",
+        apiKey: "",
+        setCacheKey: true,
+      },
+      models: {
+        "glm-5.2": { name: "GLM 5.2" },
+        "kimi-k2.7-code": { name: "Kimi K2.7 Code" },
+        "deepseek-v4-pro": { name: "DeepSeek V4 Pro" },
+        "deepseek-v4-flash": { name: "DeepSeek V4 Flash" },
+        "mimo-v2.5-pro": { name: "MiMo V2.5 Pro" },
+      },
+    },
+    category: "third_party",
+    icon: "opencode",
+    iconColor: "#211E1E",
+    templateValues: {
+      apiKey: {
+        label: "API Key",
+        placeholder: "",
+        editorValue: "",
+      },
+    },
+  },
   {
     name: "AiHubMix",
     websiteUrl: "https://aihubmix.com",