refactor: 大规模模块拆分与代码精简，新增 ai-pipeline/data-contracts 独立 crate

- 新增 aether-ai-pipeline 和 aether-data-contracts crate，将 pipeline 逻辑与数据契约从 gateway 中解耦
- 重构 admin handlers：拆分单体模块为 auth/billing/endpoint/features/model/observability/provider/system 等独立子模块
- 合并 chat/cli 重复代码路径：精简 conversion、finalize、planner 中的 sync/chat/cli 分支
- 重构 scheduler/executor/data 层，引入 facade 模式降低模块间耦合
- 移除冗余的 intent 模块，将 plan_fallback/policy/stream_path/sync_path 迁移至 executor
- 前端适配：调整 admin API 调用和 provider 模型测试对话框

frontend/src/features/usage/components/RequestDetailDrawer.vue

@@ -103,7 +103,10 @@
             >
               <span class="flex items-center gap-1">
                 <span class="font-medium text-foreground">ID:</span>
-                <span class="font-mono">{{ detail.request_id || detail.id }}</span>
+                <span
+                  class="font-mono"
+                  :title="fullRequestId"
+                >{{ displayRequestId }}</span>
               </span>
               <span class="opacity-40">|</span>
               <span>{{ formatDateTime(detail.created_at) }}</span>
@@ -698,6 +701,7 @@ import TabsContent from '@/components/ui/tabs-content.vue'
 import { Copy, Check, Maximize2, Minimize2, Columns2, RefreshCw, X, Monitor, Server, MessageSquareText, Code2, Terminal, Play } from 'lucide-vue-next'
 import { dashboardApi, type RequestDetail } from '@/api/dashboard'
 import { formatApiFormat } from '@/api/endpoints/types/api-format'
+import { formatShortRequestId } from '@/utils/format'
 import { log } from '@/utils/logger'
 
 // 子组件
@@ -770,6 +774,9 @@ let bodyLoadRequestId = 0
 let loadDetailInFlight = false
 let timelineMountTimer: ReturnType<typeof setTimeout> | null = null
 
+const fullRequestId = computed(() => detail.value?.request_id || detail.value?.id || '-')
+const displayRequestId = computed(() => formatShortRequestId(fullRequestId.value))
+
 // 监听标签页切换
 watch(activeTab, (newTab) => {
   if (!['request-headers', 'response-headers'].includes(newTab) && viewMode.value === 'compare') {