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/opencodeProviderPresets.ts

@@ -1535,34 +1535,6 @@ export const opencodeProviderPresets: OpenCodeProviderPreset[] = [
       },
     },
   },
-  {
-    name: "LionCCAPI",
-    websiteUrl: "https://vibecodingapi.ai",
-    settingsConfig: {
-      npm: "@ai-sdk/anthropic",
-      name: "LionCCAPI",
-      options: {
-        baseURL: "https://vibecodingapi.ai/v1",
-        apiKey: "",
-        setCacheKey: true,
-      },
-      models: {
-        "claude-opus-4-7": { name: "Claude Opus 4.7" },
-        "claude-sonnet-4-6": { name: "Claude Sonnet 4.6" },
-      },
-    },
-    category: "third_party",
-    isPartner: true,
-    partnerPromotionKey: "lionccapi",
-    icon: "lioncc",
-    templateValues: {
-      apiKey: {
-        label: "API Key",
-        placeholder: "",
-        editorValue: "",
-      },
-    },
-  },
   {
     name: "E-FlowCode",
     websiteUrl: "https://e-flowcode.cc",