feat(aigc): implement travel AIGC feature and clean up legacy assets

- Replace all local static AIGC assets with OSS hosted URLs to reduce bundle size
- Add travelAIGC command to ChatModel and update quick access menu to link to AIGC home
- Implement AIGC user consent flow with local storage persistence for compliance
- Refactor Discovery page layout, remove unused HeritageDiscoverySection component
- Update ChatTopNavBar to support dynamic navigation bar height based on system info
- Restructure ChatMainList layout for better discovery panel interaction
- Remove deprecated local asset files and clean up unused imports across codebase

src/pages/ChatMain/ChatTopNavBar/index.vue

@@ -1,5 +1,5 @@
 <template>
-  <view class="border-box h-44 flex flex-items-center pl-12 pr-12">
+  <view class="border-box h-44 flex flex-items-center pl-12 pr-12" :style="navBarStyle">
     <view class="nav-icon-button" @tap.stop="showDrawer">
       <uni-icons type="bars" size="24" color="#ffffff" />
     </view>
@@ -29,6 +29,10 @@ import { getCurrentConfig } from "@/constant/base";
 import SpriteAnimator from "@/components/Sprite/SpriteAnimator.vue";
 
 const props = defineProps({
+  navHeight: {
+    type: Number,
+    default: 44,
+  },
   mainPageDataModel: {
     type: Object,
     default: () => ({
@@ -60,6 +64,10 @@ const emit = defineEmits(["showDrawer"]);
 
 const showDrawer = () => emit("showDrawer");
 
+const navBarStyle = computed(() => ({
+  height: `${props.navHeight}px`,
+}));
+
 defineExpose({ show });
 </script>