refactor: move composables, stores, plugins under app/ srcDir; fix server path resolution

stores/counter.ts

@@ -1,18 +0,0 @@
-import { defineStore } from "pinia";
-
-export const useCounterStore = defineStore("counter", {
-  state: () => ({
-    count: 0,
-  }),
-  getters: {
-    doubleCount: (state) => state.count * 2,
-  },
-  actions: {
-    increment() {
-      this.count += 1;
-    },
-  },
-  persist: {
-    paths: ["count"],
-  },
-});