move from PHP to VUE, improved Certificate listning

UI/client/src/composables/useAppConfig.js

@@ -0,0 +1,28 @@
+import { ref } from 'vue';
+
+const config = ref(null);
+const isLoaded = ref(false);
+
+export function useAppConfig() {
+    const loadConfig = async () => {
+        if (isLoaded.value) return;
+        try {
+            const response = await fetch('/config.json');
+            config.value = await response.json();
+            isLoaded.value = true;
+        } catch (error) {
+            console.error('Failed to load configuration:', error);
+            // Fallback or critical error handling
+            config.value = {
+                api_base_url: 'http://localhost:5001/api/v1',
+                refresh_interval: 30000
+            };
+        }
+    };
+
+    return {
+        config,
+        isLoaded,
+        loadConfig
+    };
+}