- Backend: .env file for DB/JWT/Redis/MinIO config, appsettings.json cleared - Backend: Program.cs loads .env at startup (no extra NuGet packages) - Frontend: .env files for VITE_API_URL, api-clients use import.meta.env - Added vite-env.d.ts type declarations for both frontends - All hardcoded localhost:5000 replaced with env variable - Added .env.example template for onboarding