Production deployment documentation: Add deployment guides, environment template, verification scripts

.env.example

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+# DigiServer v2 Production Environment Configuration
+# Copy to .env and update with your production values
+# IMPORTANT: Never commit this file to git
+
+# Flask Configuration
+FLASK_ENV=production
+FLASK_APP=app.app:create_app
+
+# Security - MUST BE SET IN PRODUCTION
+# Generate with: python -c "import secrets; print(secrets.token_urlsafe(32))"
+SECRET_KEY=change-me-to-a-strong-random-secret-key-at-least-32-characters
+
+# Admin User Configuration
+ADMIN_USERNAME=admin
+ADMIN_PASSWORD=change-me-to-a-strong-password
+ADMIN_EMAIL=admin@your-domain.com
+
+# Database Configuration (optional - defaults to SQLite)
+# For PostgreSQL: postgresql://user:pass@host:5432/database
+# For SQLite: sqlite:////data/instance/dashboard.db
+# DATABASE_URL=
+
+# Server Configuration
+DOMAIN=your-domain.com
+EMAIL=admin@your-domain.com
+PREFERRED_URL_SCHEME=https
+
+# SSL/HTTPS (configured in nginx.conf by default)
+SSL_CERT_PATH=/etc/nginx/ssl/cert.pem
+SSL_KEY_PATH=/etc/nginx/ssl/key.pem
+
+# Logging
+LOG_LEVEL=INFO
+
+# Security Headers (configured in nginx.conf)
+HSTS_MAX_AGE=31536000
+HSTS_INCLUDE_SUBDOMAINS=true
+
+# Features (optional)
+ENABLE_LIBREOFFICE=true
+MAX_UPLOAD_SIZE=500000000  # 500MB
+
+# Cache Configuration (optional)
+CACHE_TYPE=simple
+CACHE_DEFAULT_TIMEOUT=300
+
+# Session Configuration
+SESSION_COOKIE_SECURE=true
+SESSION_COOKIE_HTTPONLY=true
+SESSION_COOKIE_SAMESITE=Lax
+
+# Proxy Configuration (configured in app.py)
+TRUSTED_PROXIES=10.0.0.0/8,172.16.0.0/12,192.168.0.0/16