feat: 扩展 Rust gateway 全功能模块，新增 billing/crypto/wallet crate 及完整数据层

- 新增 aether-billing、aether-crypto、aether-wallet 独立 crate
- aether-data 扩展 repository 层：announcements、auth_modules、billing、
  candidate_selection、gemini_file_mappings、global_models、management_tokens、
  oauth_providers、proxy_nodes、quota、users、wallet 等模块
- aether-gateway 新增 api/auth/billing/control/middleware/scheduler/usage/
  video_tasks/hooks/maintenance/model_fetch/provider_transport 等功能模块
- 重构 executor decision 和 gateway state 为模块目录结构
- 新增 gateway router、frontdoor 路由层及对应测试
- Python 侧 API 路由重构，新增 compat/support 模块
- 前端 Logo 组件更新及 Provider 管理页面调整

frontend/src/features/providers/components/provider-tabs/ModelMappingTab.vue

@@ -20,7 +20,7 @@
 
     <!-- 加载状态 -->
     <div
-      v-if="loading"
+      v-if="isLoading"
       class="flex items-center justify-center py-12"
     >
       <div class="animate-spin rounded-full h-8 w-8 border-b-2 border-primary" />
@@ -396,6 +396,7 @@ const props = defineProps<{
   providerKeys?: EndpointAPIKey[]
   models?: Model[]
   mappingPreview?: ProviderMappingPreviewResponse | null
+  loading?: boolean
 }>()
 
 const emit = defineEmits<{
@@ -428,6 +429,7 @@ const parsedTestRequestHeaders = computed(() => parseModelTestRequestHeadersDraf
 const testRequestHeadersError = computed(() => parsedTestRequestHeaders.value.error)
 const parsedTestRequestBody = computed(() => parseModelTestRequestBodyDraft(testRequestBodyDraft.value))
 const testRequestBodyError = computed(() => parsedTestRequestBody.value.error)
+const isLoading = computed(() => Boolean(props.loading) || loading.value)
 
 // 使用 props 传入的数据
 const models = computed(() => props.models ?? [])