耳机频响文件改为s3 存储，修改了x9 升级包的存储路径

backend/.env.example

@@ -7,7 +7,7 @@ DATABASE_PASSWORD=root123
 
 # Application Settings
 APP_NAME=Audio Dashboard API
-DEBUG=True
+APP_ENV=development
 PORT=8083
 
 # JWT
@@ -20,19 +20,22 @@ MEILISEARCH_URL=http://localhost:7700
 MEILISEARCH_API_KEY=
 MEILISEARCH_INDEX=models
 
-# AWS S3 (OTA X8)
+# AWS S3
 AWS_REGION=eu-central-1
 AWS_ACCESS_KEY_ID=
 AWS_SECRET_ACCESS_KEY=
 AWS_S3_OTA_BUCKET=luxsin-app-bucket
+AWS_S3_MEASUREMENT_BUCKET=luxsin-app-bucket
 
 # OTA URLs
 OTA_X8_PUBLIC_BASE=http://am.luxsinaudio.com
 OTA_X9_URL_BASE=http://source.luxsin.net
 
 # OTA Upload Directories
-OTA_UPLOAD_DIR_DEV=
-OTA_UPLOAD_DIR_PROD=/data/project/dashboard/upload
+# X9 升级包存储根目录（正式环境默认 /data/projects/source，路径规则：{root}/ota/{YYYYMM}/x9/{md5前5位}/LUXSIN.PKG）
+# 开发环境自动使用系统临时目录，无需配置
+OTA_UPLOAD_DIR=/data/projects/source
 
-# File Upload
-UPLOAD_FOLDER=/data/project/autoeq/measurements
+# File Upload (S3)
+# 频响文件上传到 S3: autoeq/measurements/{source}/data/{form}/{brandChar}/{brand model}.csv
+# 正式环境通过 IAM 角色访问 S3，无需配置 AWS_ACCESS_KEY_ID / AWS_SECRET_ACCESS_KEY