fix fresh install hang: split AGS into own module, remove obsolete packages

- Remove slow fallback loop from is_package_installed (only use expac)
- Move aylurs-gtk-shell from hyprland group to dedicated core/ags module
  with clear progress warning and user confirmation before build
- Install AUR packages one at a time in install_aur (better error isolation)
- Replace obsolete ttf-font-awesome with otf-font-awesome
- Remove p7zip (deleted from repos and AUR)

modules/core/packages.sh

@@ -134,7 +134,7 @@ get_group_packages() {
         brightnessctl playerctl \
         grim slurp swappy hyprshot \
         wl-clipboard libnotify sshpass \
-        hyprpolkitagent aylurs-gtk-shell awww
+        hyprpolkitagent awww
       ;;
 
     gpu)
@@ -161,7 +161,7 @@ get_group_packages() {
     fonts)
       printf '%s\n' \
         noto-fonts noto-fonts-emoji ttf-jetbrains-mono-nerd \
-        ttf-font-awesome ttf-nerd-fonts-symbols ttf-dejavu
+        otf-font-awesome ttf-nerd-fonts-symbols ttf-dejavu
       ;;
 
     tools)
@@ -182,7 +182,7 @@ get_group_packages() {
     development)
       printf '%s\n' \
         git base-devel \
-        zip unzip unrar p7zip \
+        zip unzip unrar \
         ripgrep fd bat lsd \
         htop btop fastfetch
       ;;