✨ feat(projects): 更新删除工程提示并添加存储空间监控

- 修改删除工程确认提示，明确说明会永久删除所有测线和测点数据
- 在连续采集过程中每30秒检查一次磁盘空间，低于100MB时自动停止采集并弹窗提醒

📝 docs(user-manual): 添加完整用户手册

- 新增 TEM Receiver 用户手册，涵盖安装、连接、配置、采集、波形查看、测点管理、剖面分析、工程管理、数据导出导入、主题切换、存储管理及常见问题等全部功能说明

src/services/DeviceService.ts

@@ -95,6 +95,9 @@ export function handleIncomingFrame(frame: RawFrame) {
 let _lastUIUpdateTime = 0;
 const UI_THROTTLE_MS = 150;
 let _processing = false;
+let _lastDiskCheckTime = 0;
+const DISK_CHECK_INTERVAL_MS = 30000;
+const MIN_FREE_BYTES = 100 * 1024 * 1024; // 100MB
 
 function processMeasurementPayload(
   payload: Uint8Array,
@@ -126,6 +129,24 @@ function processMeasurementPayload(
 
     void StorageService.persistFrame(measurementFrame, dataStore.sessionId);
 
+    // Periodic disk space check during continuous acquisition
+    const now2 = Date.now();
+    if (now2 - _lastDiskCheckTime > DISK_CHECK_INTERVAL_MS) {
+      _lastDiskCheckTime = now2;
+      void (async () => {
+        try {
+          const FileSystem = await import('expo-file-system/legacy');
+          const free = await FileSystem.getFreeDiskStorageAsync();
+          if (free < MIN_FREE_BYTES) {
+            const { Alert } = require('react-native');
+            Alert.alert('存储空间不足', `剩余空间不足 100MB，已自动停止采集。\n请清理手机存储或导出数据后删除旧数据。`);
+            void deviceStop();
+            devStore.setDeviceStatus('idle');
+          }
+        } catch {}
+      })();
+    }
+
     const isSingle = devStore.deviceStatus === 'single';
     const now = Date.now();
     if (isSingle || now - _lastUIUpdateTime >= UI_THROTTLE_MS) {