api: oci image pull: oci-registry-pull: fix incomplete reference regex

Previously trying to pull an OCI image with a '-' character in its name
failed because the regex did not match on it. This commit fixes this by
basing the regex on the one used in 'query-oci-repo-tags'.

Reported-by: Nicolas Frey <n.frey@proxmox.com>
Signed-off-by: Filip Schauer <f.schauer@proxmox.com>
Link: https://lore.proxmox.com/20251117171528.262443-5-f.schauer@proxmox.com
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

src/PVE/API2/Storage/Status.pm

@@ -931,7 +931,8 @@ __PACKAGE__->register_method({
                 pattern =>
                     '^(?:(?:[a-zA-Z\d]|[a-zA-Z\d][a-zA-Z\d-]*[a-zA-Z\d])'
                     . '(?:\.(?:[a-zA-Z\d]|[a-zA-Z\d][a-zA-Z\d-]*[a-zA-Z\d]))*(?::\d+)?/)?[a-z\d]+'
-                    . '(?:/[a-z\d]+(?:(?:(?:[._]|__|[-]*)[a-z\d]+)+)?)*:\w[\w.-]{0,127}$',
+                    . '(?:(?:[._]|__|[-]*)[a-z\d]+)*(?:/[a-z\d]+(?:(?:[._]|__|[-]*)[a-z\d]+)*)*'
+                    . ':\w[\w.-]{0,127}$',
             },
             filename => {
                 description =>