feat: authentication with OAuth

app/composables/usePocketbase.ts

@@ -0,0 +1,15 @@
+import PocketBase from 'pocketbase';
+
+let pbInstance: PocketBase | null = null;
+
+export const usePocketbase = () => {
+  if (!pbInstance) {
+    const config = useRuntimeConfig();
+    pbInstance = new PocketBase(config.pocketbaseUrl || 'http://localhost:8090');
+    if (import.meta.server) {
+      pbInstance.autoCancellation(false);
+    }
+  }
+
+  return pbInstance;
+};