feat: land page aggregate and phase7 document ai mainline

- 收口 page aggregate 读取、本地状态与命令客户端\n- 接入 phase7 document ai sidecar 与前端编排入口\n- 更新 architecture 与 design 状态迁移

wolai-frontend/src/app/api/documents/title/route.ts

@@ -8,9 +8,10 @@ import {
   documentBridgeErrorResponse,
 } from "@/lib/documents/bridge";
 import {
-  executeMetadataBridgeCommand,
   type DocumentTitleUpdatePayload,
 } from "@/lib/documents/metadata-command-adapter";
+import { executePageWriteBridgeCommand } from "@/lib/documents/page-write-command-adapter";
+import { PAGE_COMMAND_NAMES } from "@/lib/documents/page-command-contract";
 
 interface RenamePayload {
   documentId: string;
@@ -27,7 +28,7 @@ export async function POST(request: Request) {
       const normalizedWorkspaceId = workspaceId?.trim() || null;
       const bridgeContext = await buildDocumentBridgeContext({ request, workspaceId: normalizedWorkspaceId });
       const envelope = buildDocumentCommandEnvelope({
-        name: "documents.title.update",
+        name: PAGE_COMMAND_NAMES.updateTitle,
         payload: {
           documentId: normalizedDocumentId,
           workspaceId: normalizedWorkspaceId,
@@ -39,7 +40,7 @@ export async function POST(request: Request) {
           pageId: normalizedDocumentId,
         },
       });
-      const result = await executeMetadataBridgeCommand({
+      const result = await executePageWriteBridgeCommand({
         context: bridgeContext,
         envelope,
       });