feat(deploy): merge Phase 5a deployment configuration

Complete containerized deployment system with Docker/Podman support.

Key features:
- Multi-stage Dockerfile with Python 3.11-slim base
- Docker Compose configurations for production and development
- Nginx reverse proxy with security headers and rate limiting
- Systemd service units for Docker, Podman, and docker-compose
- Backup/restore scripts with integrity verification
- Podman compatibility (ADR-009)

All tests pass including Podman verification testing.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

docker-compose.development.yml

@@ -0,0 +1,51 @@
+version: '3.8'
+
+# Gondulf Development Configuration - MailHog and Live Reload
+# Usage: podman-compose -f docker-compose.yml -f docker-compose.development.yml up
+# Or:    docker-compose -f docker-compose.yml -f docker-compose.development.yml up
+
+services:
+  gondulf:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    image: gondulf:dev
+    container_name: gondulf_dev
+
+    # Override with bind mounts for live code reload
+    volumes:
+      - ./data:/data:Z  # :Z for SELinux (ignored on non-SELinux systems)
+      - ./src:/app/src:ro  # Read-only source code mount for live reload
+
+    # Development environment settings
+    environment:
+      - GONDULF_DEBUG=true
+      - GONDULF_LOG_LEVEL=DEBUG
+      - GONDULF_SMTP_HOST=mailhog
+      - GONDULF_SMTP_PORT=1025
+      - GONDULF_SMTP_USE_TLS=false
+      - GONDULF_HTTPS_REDIRECT=false
+      - GONDULF_SECURE_COOKIES=false
+
+    # Override command for auto-reload
+    command: uvicorn gondulf.main:app --host 0.0.0.0 --port 8000 --reload
+
+  # MailHog for local email testing
+  mailhog:
+    image: mailhog/mailhog:latest
+    container_name: gondulf_mailhog
+    restart: unless-stopped
+
+    ports:
+      - "1025:1025"  # SMTP port
+      - "8025:8025"  # Web UI
+
+    networks:
+      - gondulf_network
+
+    healthcheck:
+      test: ["CMD", "wget", "--quiet", "--tries=1", "--spider", "http://localhost:8025"]
+      interval: 10s
+      timeout: 5s
+      retries: 3
+      start_period: 5s