fix(docker): bake VITE_SKIP_RXRESUME_ONBOARDING into client build

Production images previously omitted the flag, so the full RxResume wizard
always appeared. Default skip matches self-hosted LLM-in-.env workflows;
override via docker-compose build args if needed.

Made-with: Cursor

.env.example

@@ -24,7 +24,8 @@ BASIC_AUTH_USER=
 BASIC_AUTH_PASSWORD=
 
 # Optional: client build only — skip RxResume steps in the onboarding wizard (search without PDF export).
-# Set when running `npm run build:client` / Vite dev server; not read by the Docker Node server.
+# - Local dev: set here or export before `npm run dev` / `npm run build:client` in orchestrator.
+# - Docker: set at IMAGE BUILD time (Dockerfile ARG / docker-compose build args), not runtime .env.
 # VITE_SKIP_RXRESUME_ONBOARDING=true
 
 # Public base URL used to generate tracer links when PDFs are created by