耳机频响文件改为s3 存储，修改了x9 升级包的存储路径

backend/src/services/measurementStorage.js

@@ -0,0 +1,85 @@
+/**
+ * 频响文件 S3 存储服务
+ * 本地开发环境：使用 AWS_ACCESS_KEY_ID / AWS_SECRET_ACCESS_KEY
+ * 正式环境：通过 IAM 角色访问 S3（无需配置密钥）
+ */
+const { S3Client, PutObjectCommand } = require('@aws-sdk/client-s3');
+const logger = require('../config/logger');
+
+const AWS_REGION = process.env.AWS_REGION || 'eu-central-1';
+const AWS_ACCESS_KEY_ID = process.env.AWS_ACCESS_KEY_ID || '';
+const AWS_SECRET_ACCESS_KEY = process.env.AWS_SECRET_ACCESS_KEY || '';
+const S3_BUCKET = process.env.AWS_S3_MEASUREMENT_BUCKET || process.env.AWS_S3_OTA_BUCKET || 'luxsin-app-bucket';
+
+/**
+ * 获取 S3 客户端
+ * 有显式凭证则用凭证，否则走 IAM 角色
+ */
+function getS3Client() {
+  const options = { region: AWS_REGION };
+  if (AWS_ACCESS_KEY_ID && AWS_SECRET_ACCESS_KEY) {
+    options.credentials = {
+      accessKeyId: AWS_ACCESS_KEY_ID,
+      secretAccessKey: AWS_SECRET_ACCESS_KEY,
+    };
+  }
+  return new S3Client(options);
+}
+
+/**
+ * 获取品牌首字符（字母则转大写）
+ */
+function getBrandFirstChar(brandName) {
+  if (!brandName || !brandName.length) return '_';
+  const first = brandName[0];
+  return /[a-zA-Z]/.test(first) ? first.toUpperCase() : first;
+}
+
+/**
+ * 构建 S3 Key
+ * 路径：autoeq/measurements/{source}/data/{form}/{brandFirstChar}/{brand model}.csv
+ * @param {object} params
+ * @param {string} params.source - 来源，默认 Eafonyoung
+ * @param {string} params.form - 佩戴方式 (in-ear / over-ear / earbud)
+ * @param {string} params.brandName - 品牌名称
+ * @param {string} params.modelName - 型号名称
+ * @returns {string} S3 Key
+ */
+function buildMeasurementKey({ source, form, brandName, modelName }) {
+  const src = source || 'Eafonyoung';
+  const brandChar = getBrandFirstChar(brandName);
+  const fileName = `${brandName} ${modelName}.csv`;
+  return `autoeq/measurements/${src}/data/${form}/${brandChar}/${fileName}`;
+}
+
+/**
+ * 上传频响文件到 S3
+ * @param {Buffer} buffer - 文件内容（已转换为 CSV）
+ * @param {object} params - 路径参数
+ * @returns {Promise<string>} S3 Key
+ */
+async function uploadMeasurementToS3(buffer, params) {
+  const key = buildMeasurementKey(params);
+  const client = getS3Client();
+
+  try {
+    await client.send(
+      new PutObjectCommand({
+        Bucket: S3_BUCKET,
+        Key: key,
+        Body: buffer,
+        ContentType: 'text/csv',
+      })
+    );
+    logger.info(`Measurement uploaded to s3://${S3_BUCKET}/${key}`);
+    return key;
+  } catch (e) {
+    logger.error(`S3 measurement upload failed: ${e.message}`);
+    throw new Error(`S3 上传失败：${e.message}`);
+  }
+}
+
+module.exports = {
+  uploadMeasurementToS3,
+  buildMeasurementKey,
+};