Fix set -e crash in pangolin_create_resources arithmetic

((created++)) returns exit code 1 when created=0 (post-increment
evaluates to 0, which is falsy), killing the script under set -e.
Use x=$((x + 1)) instead.

Bunker Admin

config.sh

@@ -1155,10 +1155,10 @@ pangolin_create_resources() {
       local err_msg
       err_msg=$(echo "$res_resp" | jq -r '.message // "unknown error"' 2>/dev/null)
       if echo "$err_msg" | grep -qi "already exists\|duplicate\|conflict"; then
-        ((skipped++))
+        skipped=$((skipped + 1))
       else
         warn "  Failed to create $full_domain: $err_msg"
-        ((failed++))
+        failed=$((failed + 1))
       fi
       continue
     fi
@@ -1175,7 +1175,7 @@ pangolin_create_resources() {
     pangolin_api POST "$api_url/resource/$resource_id" "$api_key" \
       '{"sso":false,"blockAccess":false}' >/dev/null
 
-    ((created++))
+    created=$((created + 1))
   done
 
   if [[ $created -gt 0 ]]; then