Use standard lower-case deb

pkg/deb/debian/prerm

@@ -0,0 +1,33 @@
+#!/bin/sh
+# --------------------------------------------------------------
+# SPDX-License-Identifier: GPL-3.0-or-later
+# --------------------------------------------------------------
+# deb File      : prerm
+# File Authors  : sanchuanhehe <wyihe5520@gmail.com>
+# Contributors  :   Nil Null   <nil@null.org>
+#	            |
+# Created On    : <2025-06-14>
+# Last Modified : <2025-06-16>
+#
+# prerm script for chsrc
+# --------------------------------------------------------------
+
+set -e
+
+case "$1" in
+    remove|upgrade|deconfigure)
+        # Nothing special to do during removal
+        ;;
+
+    failed-upgrade)
+        ;;
+
+    *)
+        echo "prerm called with unknown argument \`$1'" >&2
+        exit 1
+        ;;
+esac
+
+#DEBHELPER#
+
+exit 0