chore(frontend): 添加 npm 锁定文件和自动生成文件

- 添加 package-lock.json，npm 依赖版本锁定
- 添加 auto-imports.d.ts，unplugin-auto-import 自动生成的类型声明
- 添加 components.d.ts，unplugin-vue-components 自动生成的类型声明
- 添加 public/ 静态资源目录

frontend/auto-imports.d.ts

@@ -0,0 +1,9 @@
+/* eslint-disable */
+/* prettier-ignore */
+// @ts-nocheck
+// noinspection JSUnusedGlobalSymbols
+// Generated by unplugin-auto-import
+export {}
+declare global {
+
+}

frontend/components.d.ts

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+/* eslint-disable */
+/* prettier-ignore */
+// @ts-nocheck
+// Generated by unplugin-vue-components
+// Read more: https://github.com/vuejs/core/pull/3399
+export {}
+
+declare module 'vue' {
+  export interface GlobalComponents {
+    AppHeader: typeof import('./src/components/Layout/AppHeader.vue')['default']
+    AppMain: typeof import('./src/components/Layout/AppMain.vue')['default']
+    AppSidebar: typeof import('./src/components/Layout/AppSidebar.vue')['default']
+    AuditLogTable: typeof import('./src/components/AuditLogTable.vue')['default']
+    ElButton: typeof import('element-plus/es')['ElButton']
+    ElForm: typeof import('element-plus/es')['ElForm']
+    ElFormItem: typeof import('element-plus/es')['ElFormItem']
+    ElIcon: typeof import('element-plus/es')['ElIcon']
+    ElInput: typeof import('element-plus/es')['ElInput']
+    ElOption: typeof import('element-plus/es')['ElOption']
+    ElSelect: typeof import('element-plus/es')['ElSelect']
+    RouterLink: typeof import('vue-router')['RouterLink']
+    RouterView: typeof import('vue-router')['RouterView']
+    SubsystemCard: typeof import('./src/components/SubsystemCard.vue')['default']
+  }
+}

frontend/public/.gitkeep

@@ -0,0 +1,5 @@
+# 静态资源目录
+
+存放静态资源文件，构建时原样复制到 dist 目录：
+- favicon.ico: 网站图标
+- 图片资源等