chore: bump version to 1.2.50

update changelog to 1.2.50

Log: update changelog to 1.2.50

Author: mhduiy

debian/changelog

@@ -1,3 +1,9 @@
+dde-application-manager (1.2.50) unstable; urgency=medium
+
+  * fix: correct user application directory path and refactor parsers
+
+ -- zhangkun <zhangkun2@uniontech.com>  Thu, 23 Apr 2026 21:46:55 +0800
+
 dde-application-manager (1.2.49) unstable; urgency=medium
 
   * refactor: optimize performance, adopt Qt 6 APIs, and fix XDG