fix: replace numlockx with native numlock_by_default; remove invalid --numlock from greetd

- Remove invalid --numlock flag from tuigreet command in greetd config
  (not a recognized tuigreet parameter, caused boot error)
- Replace X11-only 'numlockx on' in Hyprland with native
  'numlock_by_default = true' in the input section
- Update Ansible template and CHANGELOG accordingly

ansible/roles/hyprland/templates/hyprland.conf.j2

@@ -25,6 +25,7 @@ input {
     kb_layout = de
     follow_mouse = 1
     sensitivity = 0
+    numlock_by_default = true
 }
 
 device {
@@ -61,9 +62,6 @@ dwindle {
     preserve_split = yes
 }
 
-# NumLock
-exec-once = numlockx on
-
 # Keybindings
 $mainMod = SUPER