fix(ns): root-qualify PHP builtins after PSR-4 move

Namespaced classes resolved DateTimeImmutable etc. under AKSRT\*
(e.g. Credits\DateTimeImmutable). Prefix with \ globally.

src/AKSRT/Auth/Moderation.php

@@ -228,7 +228,7 @@ class Moderation {
 
             $decision = $this->enrich_moderation_result($decision, $commentdata);
             $this->remember_result($commentdata, $decision);
-        } catch (Exception $e) {
+        } catch (\Exception $e) {
             // Intentionally silent: keep moderation flow without writing runtime logs.
         }