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/src/mobileHostBridge.ts

@@ -13,6 +13,7 @@ import {
 } from 'react-native';
 
 import {
+  type ClipboardReadTextResult,
   type ClipboardWriteTextPayload,
   type FileExportImagePayload,
   type FileExportImageResult,
@@ -30,6 +31,7 @@ import {
   type HostBridgeResponse,
   type NavigateNativePagePayload,
   normalizeHostBridgeBadgeCount,
+  normalizeHostBridgeClipboardText,
   normalizeHostBridgeColorScheme,
   normalizeHostBridgeExportFileName,
   normalizeHostBridgeExternalUrl,
@@ -74,6 +76,7 @@ export const MOBILE_HOST_CAPABILITIES: HostBridgeCapability[] = [
   'network.status',
   'network.statusChanged',
   'clipboard.writeText',
+  'clipboard.readText',
   'file.exportText',
   'file.exportImage',
   'file.importImage',
@@ -229,6 +232,20 @@ async function writeClipboard(payload: unknown) {
   return true;
 }
 
+async function readClipboard(): Promise<ClipboardReadTextResult> {
+  const result = normalizeHostBridgeClipboardText(
+    await Clipboard.getStringAsync(),
+  );
+  if (!result) {
+    throw {
+      code: 'host_error',
+      message: 'clipboard text unavailable',
+    } satisfies HostBridgeError;
+  }
+
+  return result;
+}
+
 async function exportTextFile(payload: unknown): Promise<FileExportTextResult> {
   const exportPayload = payload as FileExportTextPayload | undefined;
   const content = exportPayload?.content;
@@ -606,6 +623,8 @@ async function handleRequest(request: HostBridgeRequest) {
       return ok(request, await getMobileNetworkStatus());
     case 'clipboard.writeText':
       return ok(request, await writeClipboard(request.payload));
+    case 'clipboard.readText':
+      return ok(request, await readClipboard());
     case 'file.exportText':
       return ok(request, await exportTextFile(request.payload));
     case 'file.exportImage':