- merge: sync with origin/main, resolve renewed conflicts

- fix(tauri): union command handlers (import/export + speedtest/custom endpoints)
- fix(api): keep import/export APIs and provider-switched listener together
- chore(presets): retain legacy model keys alongside new defaults (GLM)
- chore(rust): keep chrono dep; lockfile updated by merge

src/lib/tauri-api.ts

@@ -428,7 +428,7 @@ export const tauriAPI = {
       return null;
     }
   },
-  
+
   // 监听供应商切换事件
   onProviderSwitched: async (
     callback: (data: { appType: string; providerId: string }) => void,