fix: 移除后台登录默认凭据

ai_knowledge_base_v2/docker-compose.dev.yml

@@ -40,7 +40,7 @@ services:
       context: ./apps/backend
     container_name: ai_kb_v2_backend
     environment:
-      APP_ENV: docker
+      APP_ENV: ${APP_ENV:-docker}
       DEBUG: "true"
       DATABASE_URL: mysql+pymysql://ai_kb:ai_kb@mysql:3306/ai_knowledge_base_v2?charset=utf8mb4
       REDIS_URL: redis://redis:6379/0
@@ -58,6 +58,9 @@ services:
       FEISHU_SEARCH_URL: "${FEISHU_SEARCH_URL:-}"
       FEISHU_APP_ID: "${FEISHU_APP_ID:-}"
       FEISHU_APP_SECRET: "${FEISHU_APP_SECRET:-}"
+      BOOTSTRAP_ADMIN_USERNAME: ${BOOTSTRAP_ADMIN_USERNAME:-admin}
+      BOOTSTRAP_ADMIN_PASSWORD: ${BOOTSTRAP_ADMIN_PASSWORD:-admin123456}
+      BOOTSTRAP_ADMIN_NAME: ${BOOTSTRAP_ADMIN_NAME:-系统管理员}
       AUTO_CREATE_TABLES: "false"
     ports:
       - "8100:8100"