feat: 添加.prettierignore解决ESLint插件冲突

- 修复Cursor中ESLint无法找到prettier-plugin-tailwindcss的错误
- 让根目录prettier配置忽略web/admin-spa目录
- 保持前端和后端prettier配置的独立性
- 避免在根目录安装不必要的tailwindcss插件依赖

.prettierignore

@@ -0,0 +1,18 @@
+# Ignore frontend directory as it has its own prettier config and plugins
+web/admin-spa/
+
+# Ignore node_modules
+node_modules/
+
+# Ignore build outputs
+dist/
+build/
+coverage/
+
+# Ignore logs
+logs/
+*.log
+
+# Ignore temporary files
+*.tmp
+*.temp