fix: Correct syntax error in install.sh

- Fixed a syntax error in the `check_requirements` function by replacing the incorrect closing brace with `fi`.
- This change ensures proper script execution and improves error handling for user permissions.

This commit addresses a critical issue in the installation script to enhance reliability.

analysis

@@ -0,0 +1,8 @@
+1. 问题定位
+- 错误发生在第68行附近的 `}` 处
+- 这是一个 shell 脚本语法错误
+- 检查发现是 check_requirements 函数中的花括号闭合问题
+
+2. 解决方案
+- 移除多余的花括号
+- 确保函数语法正确 

install.sh

@@ -65,7 +65,7 @@ check_requirements() {
     if [ ! -w "$INSTALL_DIR" ]; then
         error "No write permission for $INSTALL_DIR. Please run with sudo." \
               "没有 $INSTALL_DIR 的写入权限。请使用 sudo 运行此脚本。"
-    }
+    fi
 }
 
 # Verify binary / 验证二进制文件