fix(opencode): fix add/remove provider flow and toast messages

- Create separate removeFromLiveConfig API for additive mode apps
  (remove only removes from live config, not database)
- Fix useSwitchProviderMutation to invalidate opencodeLiveProviderIds
  cache so button state updates correctly after add operation
- Show appropriate toast messages:
  - Add: "已添加到配置" / "Added to config"
  - Remove: "已从配置移除" / "Removed from config"
- Add i18n texts for addToConfigSuccess and removeFromConfigSuccess

src-tauri/src/commands/provider.rs

@@ -60,6 +60,16 @@ pub fn delete_provider(
         .map_err(|e| e.to_string())
 }
 
+/// Remove provider from live config only (for additive mode apps like OpenCode)
+/// Does NOT delete from database - provider remains in the list
+#[tauri::command]
+pub fn remove_provider_from_live_config(app: String, id: String) -> Result<bool, String> {
+    let app_type = AppType::from_str(&app).map_err(|e| e.to_string())?;
+    ProviderService::remove_from_live_config(app_type, &id)
+        .map(|_| true)
+        .map_err(|e| e.to_string())
+}
+
 /// 切换供应商
 fn switch_provider_internal(state: &AppState, app_type: AppType, id: &str) -> Result<(), AppError> {
     ProviderService::switch(state, app_type, id)