Align env templates with shared secret inventory

backend/.env.example

@@ -9,10 +9,13 @@ APP_NAME=BlackRoad Operating System
 APP_VERSION=1.0.0
 DEBUG=False
 ENVIRONMENT=production
+NODE_ENV=production
+PYTHON_ENV=production
 
 # Database connectivity
 DATABASE_URL=postgresql://YOUR_DB_USER:YOUR_DB_PASSWORD@YOUR_DB_HOST:5432/blackroad
 DATABASE_ASYNC_URL=postgresql+asyncpg://YOUR_DB_USER:YOUR_DB_PASSWORD@YOUR_DB_HOST:5432/blackroad
+POSTGRES_URL=postgresql://YOUR_DB_USER:YOUR_DB_PASSWORD@YOUR_DB_HOST:5432/blackroad
 REDIS_URL=redis://YOUR_REDIS_HOST:6379/0
 
 # Security / auth
@@ -22,6 +25,9 @@ ACCESS_TOKEN_EXPIRE_MINUTES=30
 REFRESH_TOKEN_EXPIRE_DAYS=7
 WALLET_MASTER_KEY=changeme-wallet-master-key
 ALLOWED_ORIGINS=https://blackroad.systems,https://your-frontend.example
+JWT_SECRET=changeme-jwt-secret
+SESSION_SECRET=changeme-session-secret
+NEXTAUTH_SECRET=changeme-nextauth-secret
 
 # Object storage
 AWS_ACCESS_KEY_ID=YOUR_AWS_ACCESS_KEY_ID
@@ -38,6 +44,7 @@ EMAIL_FROM=blackroad@example.com
 
 # AI integrations
 OPENAI_API_KEY=sk-your-openai-key
+ANTHROPIC_API_KEY=anthropic-key-placeholder
 
 # Blockchain tuning
 BLOCKCHAIN_DIFFICULTY=4
@@ -50,9 +57,10 @@ RAILWAY_ENVIRONMENT_ID=00000000-0000-0000-0000-000000000000
 RAILWAY_DOMAIN=your-service.up.railway.app
 SLACK_WEBHOOK_URL=https://hooks.slack.com/services/XXX/YYY/ZZZ
 DISCORD_WEBHOOK_URL=https://discord.com/api/webhooks/XXX/YYY
+CLOUDFLARE_API_TOKEN=cloudflare-api-token-placeholder
 
 # Optional cloud/API integrations
-DIGITALOCEAN_TOKEN=your-digitalocean-token
+DIGITAL_OCEAN_API_KEY=your-digital-ocean-api-key
 GITHUB_TOKEN=your-github-personal-access-token
 HUGGINGFACE_TOKEN=your-huggingface-token
 VERCEL_TOKEN=vercel-token-placeholder