chore: bump version to 1.1.18

update changelog to 1.1.18

Author: mhduiy

debian/changelog

@@ -1,3 +1,11 @@
+deepin-desktop-theme (1.1.18) unstable; urgency=medium
+
+  * feat: add origin theme
+  * feat: add origin theme and improve xdgicon-convert tool
+  * feat: add deepin-xdgicon-convert tool
+
+ -- zhangkun <[email protected]>  Thu, 16 Oct 2025 20:52:06 +0800
+
 deepin-desktop-theme (1.1.17) unstable; urgency=medium
 
   * fix: improve icon file synchronization logic