feat(aigc): fully integrate backend API and replace mock data

- Replace all static mock data with real backend API calls for templates, generation tasks, credit balance and recharge
- Remove deprecated mock data files including templates.js, versionOptions.js, records.js and packages.js
- Add useCurrentCredit composable for fetching and managing user credit balance
- Update all components to align with new backend data shapes (e.g. templateItemId instead of id)
- Add loading and disabled states for interactive UI elements
- Implement full WeChat mini-program payment flow for credit recharge
- Fix template and record card UI styling and media handling
- Set developVersion flag to true for testing environment

src/pages-aigc/detail/detail.vue

@@ -18,17 +18,23 @@
 </template>
 
 <script setup>
-import { computed, ref } from "vue";
+import { computed } from "vue";
+import { onShow } from "@dcloudio/uni-app";
 import AigcTopBar from "@/pages-aigc/components/AigcTopBar/index.vue";
+import { useCurrentCredit } from "@/pages-aigc/hooks/useCurrentCredit.js";
 import ContinuationCard from "./components/ContinuationCard/index.vue";
 import ResultActions from "./components/ResultActions/index.vue";
 import ResultMeta from "./components/ResultMeta/index.vue";
 import ResultPreview from "./components/ResultPreview/index.vue";
 import { aigcDetailResult } from "./data/result.js";
 
-const pointBalance = ref(300);
+const { pointBalance, fetchCurrentCredit } = useCurrentCredit();
 const result = aigcDetailResult;
 
+onShow(() => {
+  fetchCurrentCredit();
+});
+
 const metaItems = computed(() => [
   {
     label: "结果",