Refine install and update scripts for Warracker

Standardized messaging in update script to use 'Warracker' instead of variable. Updated install script to use 'apt' instead of 'apt-get', improved PostgreSQL setup messaging, and added 'apt clean' to cleanup steps.

ct/warracker.sh

@@ -37,13 +37,13 @@ function update_script() {
 
         fetch_and_deploy_gh_release "warracker" "sassanix/Warracker" "tarball" "latest" "/opt/warracker"
 
-        msg_info "Updating $APP"
+        msg_info "Updating Warracker"
         cd /opt/warracker/backend
         $STD uv venv .venv
         $STD source .venv/bin/activate
         $STD uv pip install -r requirements.txt
-        msg_ok "Updated $APP"
-        
+        msg_ok "Updated Warracker"
+
         msg_info "Starting Services"
         systemctl start warracker
         systemctl start nginx