fix: always load provider URLs from config, fallback to localhost

tui.tsx

@@ -280,7 +280,7 @@ const tui: TuiPlugin = async (api) => {
     bump()
   }
 
-  let llamaServerUrls: string[] = ["http://localhost:8080"]
+  let llamaServerUrls: string[] = []
   let llamaServerModel: string | undefined
 
   const pollMetrics = async () => {
@@ -508,11 +508,11 @@ const tui: TuiPlugin = async (api) => {
   })
 
   try {
-    if (!llamaServerUrls.length) {
-      llamaServerUrls = await loadConfigUrls(api)
-    }
+    const configUrls = await loadConfigUrls(api)
+    llamaServerUrls = configUrls.length > 0 ? configUrls : ["http://localhost:8080"]
   } catch (e) {
     console.error("[oc-ls-stats] loadConfigUrls error:", e)
+    llamaServerUrls = ["http://localhost:8080"]
   }
 
   api.slots.register({