接入原生壳剪贴板读取能力

新增 clipboard.readText HostBridge 契约和 H5 facade

移动端通过 expo-clipboard 读取纯文本剪贴板

桌面端通过 Tauri clipboard-manager 读取纯文本剪贴板

更新壳能力检查、测试、方案文档和共享决策记录

apps/mobile-shell/scripts/check-config.mjs

@@ -179,6 +179,7 @@ for (const snippet of [
   'file.exportText',
   'file.exportImage',
   'file.importImage',
+  'clipboard.readText',
   'notification.showLocal',
   'network.status',
   'getMobileNetworkStatus',
@@ -187,9 +188,11 @@ for (const snippet of [
   'Notifications.getPermissionsAsync',
   'Notifications.requestPermissionsAsync',
   'Sharing.shareAsync',
+  'Clipboard.getStringAsync',
   'ImagePicker.launchImageLibraryAsync',
   'ImagePicker.requestMediaLibraryPermissionsAsync',
   'normalizeHostBridgeExportFileName',
+  'normalizeHostBridgeClipboardText',
   'base64Data',
 ]) {
   if (!bridgeSource.includes(snippet)) {
@@ -218,6 +221,7 @@ for (const capability of [
   'navigation.canGoBack',
   'app.openExternalUrl',
   'clipboard.writeText',
+  'clipboard.readText',
   'file.exportText',
   'file.exportImage',
   'file.importImage',