feat!: rewrite frontend in Vue 3 with Pinia, DaisyUI, vite-plugin-pwa

Migrates every component from class-based vue-property-decorator to
<script setup> + Composition API. Replaces Vuex 3 + vuex-class with a
single Pinia store (persisted via pinia-plugin-persistedstate). Swaps
Bulma + bulma-{checkradio,switch,pricingtable} for DaisyUI 5 utilities
on Tailwind 4. Replaces register-service-worker with vite-plugin-pwa
(workbox, skipWaiting/clientsClaim preserved).

Plugins replaced:
- vue-class-component / vue-property-decorator -> <script setup>
- vuex / vuex-class / vuex-persist -> pinia + persistedstate
- vue-i18n 8 -> vue-i18n 11 (composition mode, legacy: false)
- vue-click-outside -> @vueuse/core onClickOutside
- @xkeshi/vue-qrcode -> qrcode.vue
- vue-currency-input 1 -> vue-currency-input 3 (composable wrapper)
- bus-event (Vue instance) -> mitt
- Vue filters -> plain functions imported per component

BREAKING: drops Stripe / pricing entirely (Payment, PricingTable,
/pricing route, vue-stripe-checkout, bulma-pricingtable).

Clears unused Cypress and Jest test scaffolding; leaves a Vitest
harness behind for future tests.

src/components/AxisLabel.vue

@@ -1,29 +1,19 @@
+<script setup lang="ts">
+import { computed } from 'vue'
+import chartService from '@/services/ChartService'
+import type IStat from '@/models/IStat'
+
+const props = defineProps<{
+  stat: IStat
+  index: number
+  total: number
+}>()
+
+const point = computed(() =>
+  chartService.valueToPoint(props.stat.percent + 10, props.index, props.total)
+)
+</script>
+
 <template>
   <text :x="point.x" :y="point.y">{{ stat.label }}</text>
 </template>
-
-<script lang="ts">
-import { Component, Vue, Prop } from 'vue-property-decorator'
-import chartService from '@/services/ChartService'
-import IStat from '@/models/IStat'
-import IPoint from '@/models/IPoint'
-
-@Component
-export default class AxisLabel extends Vue {
-  @Prop({ type: Object, required: true })
-  public stat!: IStat
-  @Prop({ type: Number, required: true })
-  public index!: number
-  @Prop({ type: Number, required: true })
-  public total!: number
-
-  public get point(): IPoint {
-    return chartService.valueToPoint(
-      this.stat.percent + 10,
-      this.index,
-      this.total
-    )
-  }
-}
-</script>
-