deploy(v2): h5 build with base /v2/h5, admin dockerfile & nginx route, shared compose

deploy/admin.Dockerfile

@@ -1,4 +1,5 @@
-# InkReach Admin - Vite build served by nginx
+# InkReach Admin (v2) - Vite build served by nginx
+# v2 部署本地化：与现网共用 official.inkreach.cc，SPA 路径挂 /v2/admin/ 下
 FROM node:20-alpine AS build
 WORKDIR /app
 RUN corepack enable
@@ -16,7 +17,7 @@ COPY apps/admin apps/admin
 RUN pnpm --filter @inkreach/admin exec vite build
 
 FROM nginx:1.27-alpine
-COPY --from=build /app/apps/admin/dist /usr/share/nginx/html/admin
+COPY --from=build /app/apps/admin/dist /usr/share/nginx/html/v2/admin
 COPY deploy/nginx/admin.conf /etc/nginx/conf.d/default.conf
-COPY deploy/h5 /usr/share/nginx/html/h5
+COPY deploy/h5 /usr/share/nginx/html/v2/h5
 EXPOSE 80