Fix Docker build scripts

Author: N2D4

claude/CLAUDE-KNOWLEDGE.md

@@ -383,3 +383,6 @@ A: Next.js dev app-page runtimes (`app-page*.runtime.dev.js`) include their own
 
 Q: How can we replace the huge `next@16.1.7` patch file with a resilient install-time rewrite?
 A: Use a strict root `postinstall` script that rewrites only Next `>=16` app-page dev runtime bundles (`app-page*.runtime.dev.js`) from `doNotLimit=new WeakSet;async_hooks.createHook(` to the guarded `STACK_DISABLE_REACT_ASYNC_DEBUG_INFO` form. Guardrails should fail loud on marker mismatches, mixed guarded/unguarded states, replacement counts not equal to one, or missing runtime fingerprints; the script should also be idempotent (`patched=0, alreadyPatched>0` on second run).
+
+Q: Why can Turbo-pruned Docker builds fail with `Cannot find module /app/scripts/postinstall-patch-next-async-debug-info.mjs` during `pnpm install`?
+A: In pruned builder stages, we copy `/app/out/json` and run `pnpm install` before copying `/app/out/full`. The root `package.json` still runs `postinstall: node ./scripts/postinstall-patch-next-async-debug-info.mjs`, but that script is not present yet. Fix by copying `scripts/postinstall-patch-next-async-debug-info.mjs` into the builder stage before `pnpm install` (for all Dockerfiles using the prune pattern).

docker/backend/Dockerfile

@@ -44,6 +44,7 @@ COPY .gitignore .
 COPY pnpm-workspace.yaml .
 COPY turbo.json .
 COPY configs ./configs
+COPY --from=pruner /app/scripts/postinstall-patch-next-async-debug-info.mjs ./scripts/
 RUN STACK_SKIP_TEMPLATE_GENERATION=true pnpm install --frozen-lockfile
 
 COPY --from=pruner /app/out/full/ .

docker/local-emulator/Dockerfile

@@ -42,6 +42,7 @@ COPY .gitignore .
 COPY pnpm-workspace.yaml .
 COPY turbo.json .
 COPY configs ./configs
+COPY --from=pruner /app/scripts/postinstall-patch-next-async-debug-info.mjs ./scripts/
 RUN --mount=type=cache,id=pnpm,target=/pnpm/store STACK_SKIP_TEMPLATE_GENERATION=true pnpm install --frozen-lockfile
 
 # copy over the rest of the code for the build

docker/server/Dockerfile

@@ -40,6 +40,7 @@ COPY .gitignore .
 COPY pnpm-workspace.yaml .
 COPY turbo.json .
 COPY configs ./configs
+COPY --from=pruner /app/scripts/postinstall-patch-next-async-debug-info.mjs ./scripts/
 RUN --mount=type=cache,id=pnpm,target=/pnpm/store STACK_SKIP_TEMPLATE_GENERATION=true pnpm install --frozen-lockfile
 
 # copy over the rest of the code for the build