fix: 添加 OSS 环境变量配置，修复 TTS 语音合成 502 错误

backend/.env 被 .gitignore 忽略，服务器上不存在 OSS 配置。
将 OSS 变量添加到根 .env 并通过 docker-compose 注入后端容器。

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.env

@@ -28,3 +28,10 @@ SSO_REDIRECT_URI=http://192.168.92.150/api/oauth/callback
 SSO_ADMIN_REDIRECT_URI=http://192.168.92.150/api/admin/oauth/callback
 SSO_SCOPE=profile email
 SSO_LOGOUT_REDIRECT_URL=http://192.168.92.61:9200/login
+
+# ==================== OSS 对象存储配置 ====================
+OSS_ACCESS_KEY_ID=LTAI5tHETpDzVUPDfPLRn7Pk
+OSS_ACCESS_KEY_SECRET=GkYCCiFMKYIAyPGnUcbqJjRw3XIekX
+OSS_ENDPOINT=oss-cn-beijing.aliyuncs.com
+OSS_BUCKET_NAME=wxcz-aigc-space
+OSS_BUCKET_DOMAIN=wxcz-aigc-space.oss-cn-beijing.aliyuncs.com

docker-compose.yml

@@ -67,6 +67,12 @@ services:
       - SSO_ADMIN_REDIRECT_URI=${SSO_ADMIN_REDIRECT_URI:-http://192.168.92.150/api/admin/oauth/callback}
       - SSO_SCOPE=${SSO_SCOPE:-profile email}
       - SSO_LOGOUT_REDIRECT_URL=${SSO_LOGOUT_REDIRECT_URL:-http://192.168.92.61:9200/login}
+      # OSS 配置
+      - OSS_ACCESS_KEY_ID=${OSS_ACCESS_KEY_ID}
+      - OSS_ACCESS_KEY_SECRET=${OSS_ACCESS_KEY_SECRET}
+      - OSS_ENDPOINT=${OSS_ENDPOINT:-oss-cn-beijing.aliyuncs.com}
+      - OSS_BUCKET_NAME=${OSS_BUCKET_NAME}
+      - OSS_BUCKET_DOMAIN=${OSS_BUCKET_DOMAIN}
     depends_on:
       postgres:
         condition: service_healthy