fix: use strong password for MySQL in docker-compose

Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>

docker-compose.yml

@@ -5,7 +5,7 @@ services:
     container_name: martial-mysql
     restart: always
     environment:
-      MYSQL_ROOT_PASSWORD: 123456
+      MYSQL_ROOT_PASSWORD: Martial@2026#Secure!Pwd
       MYSQL_DATABASE: martial_db
       TZ: Asia/Shanghai
     ports:
@@ -15,7 +15,7 @@ services:
       - ./database:/docker-entrypoint-initdb.d
     command: --character-set-server=utf8mb4 --collation-server=utf8mb4_unicode_ci
     healthcheck:
-      test: ["CMD", "mysqladmin", "ping", "-h", "localhost", "-u", "root", "-p123456"]
+      test: ["CMD", "mysqladmin", "ping", "-h", "localhost", "-u", "root", "-pMartial@2026#Secure!Pwd"]
       interval: 10s
       timeout: 5s
       retries: 5