feat(settings): add 'Apply to Claude Code extension' toggle

- Apply immediately on save (write or remove primaryApiKey)
- Honor setting on provider switch (enabled: write for non-official, remove for official; disabled: no auto writes)
- Remove per-provider Claude plugin buttons from ProviderList
- Upsert primaryApiKey=any preserving other fields; respect override dir
- Add zh/en i18n for the new setting

src/App.tsx

@@ -183,9 +183,14 @@ function App() {
     });
   };
 
-  // 同步 Claude 插件配置（写入/移除固定 JSON）
+  // 同步 Claude 插件配置（按设置决定是否联动；开启时：非官方写入，官方移除）
   const syncClaudePlugin = async (providerId: string, silent = false) => {
     try {
+      const settings = await window.api.getSettings();
+      if (!(settings as any)?.enableClaudePluginIntegration) {
+        // 未开启联动：不执行写入/移除
+        return;
+      }
       const provider = providers[providerId];
       if (!provider) return;
       const isOfficial = provider.category === "official";