🧹 清理重复配置文件

- 删除根目录中重复的 NestJS 配置文件
- 删除 tsconfig.json, tsconfig.build.json, eslint.config.mjs, .prettierrc
- 保留 wwjcloud-nest/ 目录中的完整配置
- 避免配置冲突，确保项目结构清晰

admin-vben/internal/lint-configs/prettier-config/index.mjs

@@ -0,0 +1,18 @@
+export default {
+  endOfLine: 'auto',
+  overrides: [
+    {
+      files: ['*.json5'],
+      options: {
+        quoteProps: 'preserve',
+        singleQuote: false,
+      },
+    },
+  ],
+  plugins: ['prettier-plugin-tailwindcss'],
+  printWidth: 80,
+  proseWrap: 'never',
+  semi: true,
+  singleQuote: true,
+  trailingComma: 'all',
+};