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/codexProviderPresets.ts

@@ -428,20 +428,6 @@ requires_openai_auth = true`,
     icon: "ctok",
     iconColor: "#000000",
   },
-  {
-    name: "LionCCAPI",
-    websiteUrl: "https://vibecodingapi.ai",
-    auth: generateThirdPartyAuth(""),
-    config: generateThirdPartyConfig(
-      "lionccapi",
-      "https://vibecodingapi.ai/v1",
-      "gpt-5.4",
-    ),
-    category: "third_party",
-    isPartner: true,
-    partnerPromotionKey: "lionccapi",
-    icon: "lioncc",
-  },
   {
     name: "E-FlowCode",
     websiteUrl: "https://e-flowcode.cc",