Fix Java 17 compilation errors in OpenApiSpecGenerator

- Line 950: isSystemService() takes AxisService, not String — pass
  the service object instead of svcName
- Line 1002: SLF4J debug(String, int) resolves to debug(String, Throwable)
  under Java 17 — use string concatenation instead

These errors caused the GitHub Actions Site job to fail.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: robertlazarski

modules/openapi/src/main/java/org/apache/axis2/openapi/OpenApiSpecGenerator.java

@@ -947,7 +947,7 @@ public String generateMcpResourcesJson(HttpServletRequest request) {
             java.util.Map<String, AxisService> services = axisConfig.getServices();
             for (AxisService service : services.values()) {
                 String svcName = service.getName();
-                if (isSystemService(svcName)) continue;
+                if (isSystemService(service)) continue;
 
                 // URI: logical identifier for the resource in the MCP protocol.
                 // Uses the "axis2://" scheme so clients can distinguish these
@@ -999,7 +999,7 @@ public String generateMcpResourcesJson(HttpServletRequest request) {
                 metadata.put("requiresAuth", requiresAuth);
             }
 
-            log.debug("Generated MCP resources JSON ({} services)", resources.size());
+            log.debug("Generated MCP resources JSON (" + resources.size() + " services)");
             return jackson.writeValueAsString(root);
 
         } catch (Exception e) {