feat(presets): add NekoCode partner preset for 6 apps

Partner aggregator (New API gateway) across Claude Code, Claude Desktop,
Codex, OpenCode, OpenClaw, and Hermes -- no Gemini, since its /v1beta
surface falls through to the web app. Claude Code and Claude Desktop use
the bare host https://nekocode.ai; Codex, OpenCode, OpenClaw, and Hermes
use /v1 with gpt-5.5.

Marks isPartner with the ?aff=CCSWITCH referral on apiKeyUrl only (the
website URL and every API endpoint stay bare, so the attribution param
never rides on a real request). Adds the partnerPromotion blurb in all
four locales and a sponsor row appended to the end of all four READMEs,
surfacing the CC Switch offer: 10% off top-ups with promo code cc-switch.
Registers the logo-derived nekocode-icon.png via URL import; the README
banner is normalized to the standard 1920x798 aspect ratio.

src/config/opencodeProviderPresets.ts

@@ -478,6 +478,34 @@ export const opencodeProviderPresets: OpenCodeProviderPreset[] = [
       },
     },
   },
+  {
+    name: "NekoCode",
+    websiteUrl: "https://nekocode.ai",
+    apiKeyUrl: "https://nekocode.ai?aff=CCSWITCH",
+    settingsConfig: {
+      npm: "@ai-sdk/openai-compatible",
+      name: "NekoCode",
+      options: {
+        baseURL: "https://nekocode.ai/v1",
+        apiKey: "",
+        setCacheKey: true,
+      },
+      models: {
+        "gpt-5.5": { name: "GPT-5.5" },
+      },
+    },
+    category: "aggregator",
+    isPartner: true,
+    partnerPromotionKey: "nekocode",
+    icon: "nekocode",
+    templateValues: {
+      apiKey: {
+        label: "API Key",
+        placeholder: "",
+        editorValue: "",
+      },
+    },
+  },
   {
     name: "火山Agentplan",
     websiteUrl: "https://www.volcengine.com/product/ark",