fix: replace System.out.println debug statements with SLF4J log.debug… (#1678)

fix: replace System.out.println debug statements with SLF4J log.debug (#1675)

Unconditional System.out.println() calls in ApiClient.mustache were causing
debug log spam for every API call. Replaced with log.debug() using the
existing SLF4J logger so output only appears when DEBUG level is enabled.

Author: prachi-okta

api/src/main/resources/custom_templates/ApiClient.mustache

@@ -1436,18 +1436,18 @@ protected List<ServerConfiguration> servers = new ArrayList<ServerConfiguration>
                                                                                             if (!method.equals(HttpMethod.GET.name())) {
                                                                                             // Wrap cache operations in try-catch to prevent interference with API exceptions
                                                                                             try {
-                                                                                                System.out.println("DEBUG: Invalidating cache for " + method + " " + cacheKey);
-                                                                                                System.out.println("DEBUG: Path: " + path);
-                                                                                                System.out.println("DEBUG: Current cache: " + cache.getClass().getName());
+                                                                                                log.debug("Invalidating cache for {} {}", method, cacheKey);
+                                                                                                log.debug("Path: {}", path);
+                                                                                                log.debug("Current cache: {}", cache.getClass().getName());
                                                                                                 
                                                                                                 // Remove from current cache (based on returnType)
                                                                                                 cache.remove(cacheKey);
-                                                                                                System.out.println("DEBUG: Removed from current cache");
+                                                                                                log.debug("Removed from current cache");
                                                                                                 
                                                                                                 // Also remove from default cache in case it was cached there
                                                                                                 if (cache != defaultCache) {
                                                                                                     defaultCache.remove(cacheKey);
-                                                                                                    System.out.println("DEBUG: Removed from default cache");
+                                                                                                    log.debug("Removed from default cache");
                                                                                                 }
 
                                                                                                 // For DELETE/PUT/POST, the returnType might be void/null, so cache = defaultCache