08 定向 Bug Hunt + 架构文档刷新

## 08 定向 Bug Hunt（3.5）

- Bug 1: 侧栏「复制页面」从 `/api/documents/duplicate` 迁移到
  `copyTreeCommand()` → `/api/tree/commands`（`tree.subtree.copy`）
- Bug 2: 侧栏「清空垃圾箱」标注 TODO，等待 Rust `tree.trash.empty`
- Bug 3: 文档页「应用模板」标注 TODO，等待 Rust `tree.page.template`
- Bug 4: 删除 `createChildDocumentCommand` 死代码（函数 + 类型 + 旧
  Next.js `/api/documents/create-child` 路由）
- 归档 4 份 bug 文档到 `bugs/04-tree-domain/done/` 和
  `bugs/05-editor-mainline/done/`

## 架构文档刷新

- ARCHITECTURE.md: MVP 状态标记、三层树模型（§6.4）、8.4 AI 方向按 7-14 v2
  修正、新增 8.5 定向 Bug Hunt 节、刷新 §5 和 §9 卡点描述
- AGENTS.md: 匹配 ARCHITECTURE.md 的 AI 方向和三层模型口径
- 08 checklist: 标记 7-14 v2 影响（Phase A/B/C 重命名、新增 9 项 checklist）

关联设计稿: 7-14 v2, 08

wolai-frontend/src/app/api/documents/create-child/route.ts

@@ -1,13 +0,0 @@
-import { NextResponse } from "next/server";
-import { isConvexEnabled } from "@/lib/convex/enabled";
-import { executeDocumentCreateChildBridgeCommand } from "@/lib/documents/page-command-adapter";
-
-export const dynamic = "force-dynamic";
-
-export async function POST(request: Request) {
-  if (isConvexEnabled()) {
-    return executeDocumentCreateChildBridgeCommand(request);
-  }
-
-  return NextResponse.json({ error: "当前仅支持 Convex 模式" }, { status: 501 });
-}

wolai-frontend/src/components/editor/document-content.tsx

@@ -788,6 +788,7 @@ export function DocumentContent({
       return;
     }
     window.alert("已添加为模板");
+    // TODO: Rust `tree.page.template` 或 `page.layout.applyTemplate` 命令就绪后切到 /api/tree/commands
     router.refresh();
   }, [documentId, readOnly, router]);
 

wolai-frontend/src/components/sidebar/sidebar.tsx

@@ -132,6 +132,7 @@ import { GroupManagerDialog } from "@/components/groups/group-manager-dialog";
 import {
   copyTreeCommand,
   createDocumentCommand,
+  copyTreeCommand,
   deleteDocumentCommand,
   embedDocumentCommand,
   moveDocumentCommand,
@@ -921,12 +922,12 @@ function SidebarContent({ initialData, sidebarData: externalSidebarData, sidebar
 
   const handleDuplicateDocument = useCallback(
     async (node: SidebarTreeNode) => {
-      const response = await fetch("/api/documents/duplicate", {
-        method: "POST",
-        headers: { "Content-Type": "application/json" },
-        body: JSON.stringify({ documentId: node.id }),
-      });
-      if (!response.ok) {
+      try {
+        await copyTreeCommand({
+          targetParentId: null,
+          items: [{ documentId: node.id, recursive: true }],
+        });
+      } catch {
         window.alert("复制失败，请稍后再试");
         return;
       }
@@ -2645,6 +2646,7 @@ function SidebarContent({ initialData, sidebarData: externalSidebarData, sidebar
         return;
       }
       await Promise.all([sidebarQuery.refetch(), refreshTree()]);
+      // TODO: Rust `tree.trash.empty` 命令就绪后切到 /api/tree/commands
     } finally {
       setEmptyingTrash(false);
     }

wolai-frontend/src/lib/documents/tree-command-client.ts

@@ -71,12 +71,6 @@ export type DocumentCreateCommandResult = {
   meta?: DocumentCommandMeta;
 };
 
-export type DocumentCreateChildCommandResult = {
-  pageId: string;
-  title?: string | null;
-  meta?: DocumentCommandMeta;
-};
-
 type RenameDocumentInput = {
   documentId: string;
   workspaceId?: string | null;
@@ -141,12 +135,6 @@ type CopyTreeCommandInput = {
   }>;
 };
 
-type CreateChildDocumentInput = {
-  parentId: string | null;
-  title: string;
-  blocks: unknown[];
-};
-
 async function postDocumentCommand<TResult>(path: string, payload: unknown, fallbackMessage: string): Promise<TResult> {
   const response = await fetch(path, {
     method: "POST",
@@ -222,16 +210,6 @@ export async function createDocumentCommand(parentId: string | null): Promise<Do
   };
 }
 
-export async function createChildDocumentCommand(
-  input: CreateChildDocumentInput,
-): Promise<DocumentCreateChildCommandResult> {
-  return postDocumentCommand<DocumentCreateChildCommandResult>(
-    "/api/documents/create-child",
-    input,
-    "创建子页面失败，请稍后再试",
-  );
-}
-
 export async function renameDocumentCommand(input: RenameDocumentInput): Promise<{ ok: true; meta?: DocumentCommandMeta }> {
   const response = await postTreeCommand<TreeCommandResponse>(
     {