接入原生壳文本文件导入能力

新增 file.importText HostBridge 契约和 H5 facade

移动端通过 Expo DocumentPicker 读取受控文本文件

桌面端通过 Tauri 文件选择框读取受控文本文件

更新壳能力检查、测试、方案文档和共享决策记录

package-lock.json

@@ -17,6 +17,7 @@
         "dotenv": "^17.2.3",
         "expo": "^56.0.12",
         "expo-clipboard": "^56.0.4",
+        "expo-document-picker": "^56.0.4",
         "expo-file-system": "^56.0.8",
         "expo-haptics": "^56.0.3",
         "expo-image-picker": "^56.0.18",
@@ -6372,6 +6373,15 @@
         "react-native": "*"
       }
     },
+    "node_modules/expo-document-picker": {
+      "version": "56.0.4",
+      "resolved": "https://registry.npmjs.org/expo-document-picker/-/expo-document-picker-56.0.4.tgz",
+      "integrity": "sha512-75Apf74XNkYYohObIH19VZw42xpe0gmEnPccuzGXKVAzlvTYCfibSgW17F+6vt4paOfZEnAoZ1QFZM6dmaujRA==",
+      "license": "MIT",
+      "peerDependencies": {
+        "expo": "*"
+      }
+    },
     "node_modules/expo-file-system": {
       "version": "56.0.8",
       "resolved": "https://registry.npmjs.org/expo-file-system/-/expo-file-system-56.0.8.tgz",
@@ -17339,6 +17349,12 @@
         "@expo/env": "~2.3.0"
       }
     },
+    "expo-document-picker": {
+      "version": "56.0.4",
+      "resolved": "https://registry.npmjs.org/expo-document-picker/-/expo-document-picker-56.0.4.tgz",
+      "integrity": "sha512-75Apf74XNkYYohObIH19VZw42xpe0gmEnPccuzGXKVAzlvTYCfibSgW17F+6vt4paOfZEnAoZ1QFZM6dmaujRA==",
+      "requires": {}
+    },
     "expo-file-system": {
       "version": "56.0.8",
       "resolved": "https://registry.npmjs.org/expo-file-system/-/expo-file-system-56.0.8.tgz",