some initial API refactoring

src/stores/credentials.js

@@ -0,0 +1,19 @@
+import { defineStore } from 'pinia'
+
+const defaultState = {
+  credentials: null,
+}
+
+export const useCredentialsStore = defineStore('credentials', {
+  state: () => ({ ...defaultState }),
+  actions: {
+    setCredentials(credentials) {
+      this.credentials = credentials
+    },
+  },
+  getters: {
+    current() {
+      return window.vuex.state.users.currentUser.credentials
+    },
+  },
+})