Fix node_modules copy in web Dockerfile builder stage

Copy entire /app directory from deps stage instead of just node_modules to ensure all dependencies and pnpm workspace files are available for the build process.

docker/web.Dockerfile

@@ -19,7 +19,7 @@ RUN npm install -g pnpm \
     fi
 
 FROM base AS builder
-COPY --from=deps /app/node_modules /app/node_modules
+COPY --from=deps /app /app
 COPY . /app
 
 RUN npm install -g pnpm && pnpm --filter @nexadash/web build