refactor: frontend 重命名为 backend-adminend，新增 shccd159/shjjy153 配置

- frontend 目录迁移至 backend-adminend（管理后台前端）
- 新增 application-shccd159.yml、application-shjjy153.yml
- 更新 deploy.conf、DEPLOY.md、application.yml

Made-with: Cursor

backend-adminend/.editorconfig

@@ -0,0 +1,14 @@
+# https://editorconfig.org
+root = true
+
+[*]
+charset = utf-8
+indent_style = space
+indent_size = 2
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.md]
+insert_final_newline = false
+trim_trailing_whitespace = false