Add production deployment configurations and guides

Deployment options:
- Railway cloud deployment (recommended, 5-min setup)
- Render alternative deployment
- Docker Compose for VPS deployment
- Comprehensive environment variable documentation

Includes:
- Production-grade Dockerfile with multi-stage builds
- Docker Compose configuration for production
- Detailed deployment guide with troubleshooting
- Backup and recovery procedures
- Monitoring and scaling recommendations

Deployment paths ready:
✅ Railway (railway.app)
✅ Render (render.com)
✅ Self-hosted VPS (DigitalOcean, Linode, etc.)

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

docker-compose.prod.yml

@@ -0,0 +1,56 @@
+version: '3.9'
+
+services:
+  postgres:
+    image: postgres:16-alpine
+    environment:
+      POSTGRES_DB: trustos
+      POSTGRES_USER: trustos
+      POSTGRES_PASSWORD: ${DB_PASSWORD:?Database password required}
+    ports:
+      - "5432:5432"
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U trustos"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+
+  backend:
+    build:
+      context: .
+      dockerfile: Dockerfile.prod
+      target: backend
+    environment:
+      DATABASE_URL: postgresql+asyncpg://trustos:${DB_PASSWORD}@postgres:5432/trustos
+      SYNC_DATABASE_URL: postgresql://trustos:${DB_PASSWORD}@postgres:5432/trustos
+      SECRET_KEY: ${SECRET_KEY:?Secret key required}
+      OPENAI_API_KEY: ${OPENAI_API_KEY:-}
+      ANTHROPIC_API_KEY: ${ANTHROPIC_API_KEY:-}
+      AI_PROVIDER: ${AI_PROVIDER:-openai}
+    ports:
+      - "8000:8000"
+    depends_on:
+      postgres:
+        condition: service_healthy
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:8000/docs"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+
+  frontend:
+    build:
+      context: .
+      dockerfile: Dockerfile.prod
+      target: frontend
+    environment:
+      NEXT_PUBLIC_API_URL: ${API_URL:?API URL required}
+    ports:
+      - "3000:3000"
+    depends_on:
+      - backend
+
+volumes:
+  postgres_data: