diff --git a/Dockerfile b/Dockerfile
index d6c04a2..d51bcd9 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -24,12 +24,22 @@ FROM node:20-slim AS frontendbuild
 WORKDIR /build
 
 # Copy only the manifests first so `npm ci` caches on dependency changes.
-COPY frontend/package*.json ./
-RUN npm ci
+COPY frontend/package*.json ./frontend/
+RUN cd frontend && npm ci
 
-COPY frontend/ ./
-RUN npm run build
-# Output lands in /build/dist (Vite default), copied into the final stage below.
+# The frontend keeps its repo-relative layout here, because npm prebuild runs
+# `node ../scripts/stage-frontend.mjs`, which stages each plugin's frontend/ into
+# the Vite tree and codegens routes.gen.js. That script resolves its repo root as
+# its own directory's parent, so it needs scripts/ and plugins/ as SIBLINGS of
+# frontend/. Building with frontend/ flattened to the stage root made `../scripts`
+# resolve to /scripts and the build failed on a missing module.
+COPY scripts/stage-frontend.mjs ./scripts/
+COPY plugins/ ./plugins/
+
+COPY frontend/ ./frontend/
+RUN cd frontend && npm run build
+# Output lands in /build/frontend/dist (Vite default), copied into the final
+# stage below.
 
 # ---- Stage 2: Python application image ----
 FROM python:3.14-slim AS base
@@ -60,7 +70,7 @@ COPY scripts/ ./scripts/
 COPY wsgi.py ./
 
 # Built SPA from stage 1. Flask serves it via register_frontend_routes.
-COPY --from=frontendbuild /build/dist ./frontend/dist
+COPY --from=frontendbuild /build/frontend/dist ./frontend/dist
 
 RUN useradd --create-home --shell /bin/bash shopdb \
     && chown -R shopdb:shopdb /app