feat: add system settings with model connectivity and encrypted storage

web/src/services/settings.js

@@ -0,0 +1,19 @@
+import { apiRequest } from './api.js'
+
+export function fetchSettings() {
+  return apiRequest('/settings')
+}
+
+export function saveSettings(payload) {
+  return apiRequest('/settings', {
+    method: 'PUT',
+    body: JSON.stringify(payload)
+  })
+}
+
+export function testModelConnectivity(payload) {
+  return apiRequest('/settings/model-connectivity', {
+    method: 'POST',
+    body: JSON.stringify(payload)
+  })
+}