chore(web): use prod-only deps in runtime image

apps/web/Dockerfile

@@ -27,6 +27,20 @@ COPY apps/web/package.json ./apps/web/
 # Install dependencies (no cache mount — Kaniko builds are ephemeral in CI)
 RUN pnpm install --frozen-lockfile
 
+# ======================
+# Production dependencies stage
+# ======================
+FROM base AS prod-deps
+
+# Copy all package.json files for workspace resolution
+COPY packages/shared/package.json ./packages/shared/
+COPY packages/ui/package.json ./packages/ui/
+COPY packages/config/package.json ./packages/config/
+COPY apps/web/package.json ./apps/web/
+
+# Install production dependencies only
+RUN pnpm install --frozen-lockfile --prod
+
 # ======================
 # Builder stage
 # ======================
@@ -87,7 +101,7 @@ RUN rm -rf /usr/local/lib/node_modules/npm /usr/local/bin/npm /usr/local/bin/npx
 WORKDIR /app
 
 # Copy node_modules from builder (includes all dependencies in pnpm store)
-COPY --from=builder --chown=nextjs:nodejs /app/node_modules ./node_modules
+COPY --from=prod-deps --chown=nextjs:nodejs /app/node_modules ./node_modules
 
 # Copy built packages (includes dist/ directories)
 COPY --from=builder --chown=nextjs:nodejs /app/packages ./packages
@@ -98,7 +112,7 @@ COPY --from=builder --chown=nextjs:nodejs /app/apps/web/public ./apps/web/public
 COPY --from=builder --chown=nextjs:nodejs /app/apps/web/next.config.ts ./apps/web/
 COPY --from=builder --chown=nextjs:nodejs /app/apps/web/package.json ./apps/web/
 # Copy app's node_modules which contains symlinks to root node_modules
-COPY --from=builder --chown=nextjs:nodejs /app/apps/web/node_modules ./apps/web/node_modules
+COPY --from=prod-deps --chown=nextjs:nodejs /app/apps/web/node_modules ./apps/web/node_modules
 
 # Set working directory to web app
 WORKDIR /app/apps/web