feat(presets): add Code0.ai partner preset for 7 apps

Partner aggregator (New API gateway) across Claude Code, Claude Desktop,
Codex, Gemini, OpenCode, OpenClaw, and Hermes. Claude Code, Claude
Desktop, and Gemini use the bare host (gemini-3.1-pro-preview for
Gemini); Codex, OpenCode, OpenClaw, and Hermes use /v1 with gpt-5.5.

Marks isPartner with ?source=ccswitch attribution on apiKeyUrl only
(website URL stays clean). Adds the partnerPromotion blurb in all four
locales and a sponsor row in all four READMEs. Positioned after
ClaudeAPI in the Claude Code and Claude Desktop lists (the two apps
that carry a ClaudeAPI preset). Registers the favicon-derived code0.png
icon via URL import; the README banner is normalized to the standard
1920x798 aspect ratio.

src/config/opencodeProviderPresets.ts

@@ -450,6 +450,34 @@ export const opencodeProviderPresets: OpenCodeProviderPreset[] = [
       },
     },
   },
+  {
+    name: "Code0",
+    websiteUrl: "https://code0.ai",
+    apiKeyUrl: "https://code0.ai?source=ccswitch",
+    settingsConfig: {
+      npm: "@ai-sdk/openai-compatible",
+      name: "Code0",
+      options: {
+        baseURL: "https://code0.ai/v1",
+        apiKey: "",
+        setCacheKey: true,
+      },
+      models: {
+        "gpt-5.5": { name: "GPT-5.5" },
+      },
+    },
+    category: "aggregator",
+    isPartner: true,
+    partnerPromotionKey: "code0",
+    icon: "code0",
+    templateValues: {
+      apiKey: {
+        label: "API Key",
+        placeholder: "",
+        editorValue: "",
+      },
+    },
+  },
   {
     name: "火山Agentplan",
     websiteUrl: "https://www.volcengine.com/product/ark",