fix(docker): pin pnpm@11.6.0 via npm, fix runner stage prisma copy

Dockerfile

@@ -1,5 +1,5 @@
 FROM node:22-alpine AS base
-RUN corepack enable && corepack prepare pnpm@latest --activate
+RUN npm install -g pnpm@11.6.0
 
 # ── deps ────────────────────────────────────────────────────────────────────
 FROM base AS deps
@@ -13,7 +13,6 @@ WORKDIR /app
 COPY --from=deps /app/node_modules ./node_modules
 COPY . .
 
-# Generate Prisma client before build
 RUN pnpm prisma generate
 
 ENV NEXT_TELEMETRY_DISABLED=1
@@ -32,11 +31,7 @@ RUN addgroup --system --gid 1001 nodejs && \
 COPY --from=builder /app/public ./public
 COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
 COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
-
-# Prisma client for runtime
-COPY --from=builder /app/node_modules/.pnpm /app/node_modules/.pnpm
-COPY --from=builder /app/node_modules/@prisma /node_modules/@prisma
-COPY --from=builder /app/src/generated ./src/generated
+COPY --from=builder --chown=nextjs:nodejs /app/src/generated ./src/generated
 COPY --from=builder /app/prisma ./prisma
 
 USER nextjs