config: add Redis password and fix MySQL password

- Update backend/.env: REDIS_PASSWORD=redis_sSJJPb
- Update backend/.env.example: REDIS_PASSWORD=redis_sSJJPb
- Update docker-compose.yml: Add REDIS_PASSWORD and fix DB_PASSWORD to mysql_xEsdPa

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/.env.example

@@ -12,7 +12,7 @@ DB_PASSWORD=
 # Redis 配置
 REDIS_HOST=127.0.0.1
 REDIS_PORT=6379
-REDIS_PASSWORD=
+REDIS_PASSWORD=redis_sSJJPb
 REDIS_DATABASE=0
 
 # JWT 配置

docker-compose.yml

@@ -14,9 +14,10 @@ services:
       - DB_PORT=3306
       - DB_DATABASE=xserver
       - DB_USERNAME=root
-      - DB_PASSWORD=123456
+      - DB_PASSWORD=mysql_xEsdPa
       - REDIS_HOST=redis
       - REDIS_PORT=6379
+      - REDIS_PASSWORD=redis_sSJJPb
     networks:
       - 1panel-network
     restart: unless-stopped