chore: remove LionCC sponsor and presets

- Remove LionCC sponsor entry from all README files (en/zh/ja)
- Remove LionCCAPI presets from all provider configs
- Remove lionccapi i18n keys from all locales
- Keep lioncc.png icon file as requested

src/config/claudeProviderPresets.ts

@@ -886,20 +886,6 @@ export const providerPresets: ProviderPreset[] = [
     icon: "eflowcode",
     iconColor: "#000000",
   },
-  {
-    name: "LionCCAPI",
-    websiteUrl: "https://vibecodingapi.ai",
-    settingsConfig: {
-      env: {
-        ANTHROPIC_BASE_URL: "https://vibecodingapi.ai",
-        ANTHROPIC_AUTH_TOKEN: "",
-      },
-    },
-    category: "third_party",
-    isPartner: true,
-    partnerPromotionKey: "lionccapi",
-    icon: "lioncc",
-  },
   {
     name: "OpenRouter",
     websiteUrl: "https://openrouter.ai",