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

Add FennoAI (api.fenno.ai) as a partner aggregator preset across Claude
Code, Claude Desktop, Codex, OpenCode, OpenClaw, and Hermes (Gemini not
supported). FennoAI 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.fenno.ai)
- Codex: native Responses at api.fenno.ai, gpt-5.5
- OpenCode / OpenClaw / Hermes: gpt-5.5 over api.fenno.ai/v1
- Partner referral link as apiKeyUrl + short partner-promotion blurb in
  zh/en/ja/zh-TW
- Add FennoAI sponsor entry to all four READMEs (fenno-banner.png)
- Register fenno-icon.webp icon (URL import + iconUrls + metadata)

src/config/opencodeProviderPresets.ts

@@ -338,6 +338,35 @@ export const opencodeProviderPresets: OpenCodeProviderPreset[] = [
       },
     },
   },
+  {
+    name: "FennoAI",
+    websiteUrl: "https://api.fenno.ai",
+    apiKeyUrl:
+      "https://api.fenno.ai/register?redirect=/purchase?tab=subscription%26group=16&aff=P9MR3D3PLCNL",
+    settingsConfig: {
+      npm: "@ai-sdk/openai-compatible",
+      name: "FennoAI",
+      options: {
+        baseURL: "https://api.fenno.ai/v1",
+        apiKey: "",
+        setCacheKey: true,
+      },
+      models: {
+        "gpt-5.5": { name: "GPT-5.5" },
+      },
+    },
+    category: "aggregator",
+    isPartner: true,
+    partnerPromotionKey: "fenno",
+    icon: "fenno",
+    templateValues: {
+      apiKey: {
+        label: "API Key",
+        placeholder: "",
+        editorValue: "",
+      },
+    },
+  },
   {
     name: "火山Agentplan",
     websiteUrl: "https://www.volcengine.com/product/ark",