feat(presets): add ZetaAPI provider preset for 6 apps

Add ZetaAPI (api.zetaapi.ai) as a partner aggregator preset across Claude
Code, Claude Desktop, Codex, OpenCode, OpenClaw, and Hermes (Gemini not
supported). ZetaAPI relays native Claude/GPT, so Claude Code/Codex pass
through native models; the OpenAI-compatible apps default to gpt-5.5.

- Claude / Claude Desktop: Anthropic-compatible bare host (api.zetaapi.ai)
- Codex: native Responses at api.zetaapi.ai/v1, gpt-5.5
- OpenCode / OpenClaw / Hermes: gpt-5.5 over api.zetaapi.ai/v1
- Partner referral link (zetaapi.ai/go/ccs) as apiKeyUrl + short
  partner-promotion blurb in zh/en/ja/zh-TW
- Add ZetaAPI sponsor entry to all four READMEs (zetaapi-banner.png),
  first-recharge 10% off with promo code CC-SWITCH
- Register zetaapi-icon.png icon (URL import + iconUrls + metadata)

src/config/opencodeProviderPresets.ts

@@ -367,6 +367,34 @@ export const opencodeProviderPresets: OpenCodeProviderPreset[] = [
       },
     },
   },
+  {
+    name: "ZetaAPI",
+    websiteUrl: "https://zetaapi.ai",
+    apiKeyUrl: "https://zetaapi.ai/go/ccs",
+    settingsConfig: {
+      npm: "@ai-sdk/openai-compatible",
+      name: "ZetaAPI",
+      options: {
+        baseURL: "https://api.zetaapi.ai/v1",
+        apiKey: "",
+        setCacheKey: true,
+      },
+      models: {
+        "gpt-5.5": { name: "GPT-5.5" },
+      },
+    },
+    category: "aggregator",
+    isPartner: true,
+    partnerPromotionKey: "zetaapi",
+    icon: "zetaapi",
+    templateValues: {
+      apiKey: {
+        label: "API Key",
+        placeholder: "",
+        editorValue: "",
+      },
+    },
+  },
   {
     name: "火山Agentplan",
     websiteUrl: "https://www.volcengine.com/product/ark",