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/preinst

@@ -9,31 +9,14 @@ if [ -d "/etc/linux_patch_api" ]; then
     echo "Detected existing installation - performing upgrade"
 fi
 
-# Create system user if it doesn't exist
-if ! getent group linux-patch-api > /dev/null 2>&1; then
-    echo "Creating group linux-patch-api..."
-    groupadd --system linux-patch-api
-fi
-
-if ! getent passwd linux-patch-api > /dev/null 2>&1; then
-    echo "Creating user linux-patch-api..."
-    useradd --system \
-        --gid linux-patch-api \
-        --home-dir /var/lib/linux_patch_api \
-        --no-create-home \
-        --shell /usr/sbin/nologin \
-        --comment "Linux Patch API Service" \
-        linux-patch-api
-fi
-
 # Create required directories
 mkdir -p /etc/linux_patch_api/certs
 mkdir -p /var/lib/linux_patch_api
 mkdir -p /var/log/linux_patch_api
 
-# Set proper ownership
-chown -R linux-patch-api:linux-patch-api /var/lib/linux_patch_api
-chown -R linux-patch-api:linux-patch-api /var/log/linux_patch_api
+# Set proper ownership (service runs as root)
+chown -R root:root /var/lib/linux_patch_api
+chown -R root:root /var/log/linux_patch_api
 
 # Set secure permissions
 chmod 750 /etc/linux_patch_api