refactor: Simplify parameter parsing in install script

- Move the parameter parsing for force installation to a more logical position in the script, ensuring it executes before displaying the running mode.
- Remove redundant code related to force installation parameter parsing, improving script clarity and maintainability.

install.sh

@@ -23,6 +23,15 @@ CONFIG_DIR="/etc/funmc"
 DATA_DIR="/var/lib/funmc"
 LOG_DIR="/var/log/funmc"
 
+# 先解析参数（必须在显示运行模式前执行）
+FORCE_INSTALL=0
+for arg in "$@"; do
+    if [ "$arg" = "-force" ] || [ "$arg" = "--force" ]; then
+        FORCE_INSTALL=1
+        break
+    fi
+done
+
 echo -e "${CYAN}"
 echo "╔═══════════════════════════════════════════════════════════╗"
 echo "║                                                           ║"
@@ -46,15 +55,6 @@ if [ "$EUID" -ne 0 ]; then
     exit 1
 fi
 
-# 解析参数：-force 或 --force 为强制覆盖安装，否则为更新（不覆盖数据）
-FORCE_INSTALL=0
-for arg in "$@"; do
-    if [ "$arg" = "-force" ] || [ "$arg" = "--force" ]; then
-        FORCE_INSTALL=1
-        break
-    fi
-done
-
 # 检测系统
 detect_os() {
     if [ -f /etc/os-release ]; then