fix: remove linux-patch-api user from dpkg scripts, change ownership to root

- Remove user/group creation from preinst (service runs as root)
- Change directory ownership to root:root in preinst and postinst
- Remove user/group deletion from postrm
- Service runs as root, no dedicated user needed

debian/postinst

@@ -13,14 +13,14 @@ if [ "$1" = "configure" ]; then
         echo "Creating default config.yaml..."
         cp /etc/linux_patch_api/config.yaml.example /etc/linux_patch_api/config.yaml
         chmod 640 /etc/linux_patch_api/config.yaml
-        chown linux-patch-api:linux-patch-api /etc/linux_patch_api/config.yaml
+        chown root:root /etc/linux_patch_api/config.yaml
     fi
     
     if [ ! -f "/etc/linux_patch_api/whitelist.yaml" ]; then
         echo "Creating default whitelist.yaml..."
         cp /etc/linux_patch_api/whitelist.yaml.example /etc/linux_patch_api/whitelist.yaml
         chmod 640 /etc/linux_patch_api/whitelist.yaml
-        chown linux-patch-api:linux-patch-api /etc/linux_patch_api/whitelist.yaml
+        chown root:root /etc/linux_patch_api/whitelist.yaml
     fi
     
     # Reload systemd daemon to pick up new service file