feat: add Micu partner provider preset for Claude, Codex, OpenClaw and OpenCode

- Add Micu provider presets with openclaudecode.cn endpoint
- Register micu icon SVG in icon index with namespaced CSS classes
- Rename miku.svg to micu.svg to match icon key
- Add partnerPromotion.micu i18n keys for zh, en, ja locales

src/config/codexProviderPresets.ts

@@ -297,6 +297,23 @@ requires_openai_auth = true`,
     icon: "ucloud",
     iconColor: "#000000",
   },
+  {
+    name: "Micu",
+    websiteUrl: "https://www.openclaudecode.cn",
+    apiKeyUrl: "https://www.openclaudecode.cn/v1",
+    auth: generateThirdPartyAuth(""),
+    config: generateThirdPartyConfig(
+      "micu",
+      "https://www.openclaudecode.cn/v1",
+      "gpt-5.4",
+    ),
+    endpointCandidates: ["https://www.openclaudecode.cn/v1"],
+    category: "third_party",
+    isPartner: true, // 合作伙伴
+    partnerPromotionKey: "micu", // 促销信息 i18n key
+    icon: "micu",
+    iconColor: "#000000",
+  },
   {
     name: "OpenRouter",
     websiteUrl: "https://openrouter.ai",