fix: allow saving admin config when config file doesn't exist

- saveConfig no longer throws error when current config returns 404
- Creates new config file with current values if none exists
- User can save config for the first time without errors

src/views/AdminView.vue

@@ -1327,9 +1327,13 @@ async function saveConfig() {
   configSaving.value = true
   configSaveMsg.value = ''
   try {
+    // Try to load current config, but don't fail if it doesn't exist
+    let currentConfig: any = {}
     const res = await fetch('/api/v1/admin/config')
-    if (!res.ok) throw new Error(`Failed to load current config: HTTP ${res.status}`)
-    const currentConfig = await res.json()
+    if (res.ok) {
+      currentConfig = await res.json()
+    }
+    // If 404, just use empty currentConfig - we'll create a new file
     
     const payload = {
       version: '1.0.0',