Fly.io Private Network Configuration

[perigrin]

User Story

Implement Fly.io private network configuration using TDD to enable secure
inter-service communication across the IRC network. Write tests that validate
internal hostname resolution, encrypted service communication, and proper
network isolation from public internet.

Requirements:
- Configure Fly.io private internal networking for all services
- Validate secure inter-service communication
- Test automatic internal hostname resolution
- Ensure network resilience and performance

Expected Output

• config/network-topology.yaml - Private network configuration specification
• scripts/validate-internal-network.pl - Network connectivity validation (Perl)
• tests/test_private_networking.pl - Internal network tests (Perl)
• scripts/network-diagnostics.pl - Network troubleshooting tools (Perl)
• docs/internal-networking.md - Private network architecture documentation
• Working Fly.io private network with validated inter-service communication

Acceptance Criteria

• Write failing tests for Fly.io private network connectivity
• Configure all components to use Fly.io internal network
• Tests validate internal hostname resolution (magnet-9rl.internal, etc.)
• Secure communication verified between all services
• Network isolation from public internet maintained
• Performance tests pass for inter-service communication
• DNS resolution works correctly within private network
• Health checks validate internal network connectivity
• Service discovery through internal hostnames functional
• Network latency optimized for Fly.io infrastructure
• All private networking tests pass

Context

Fly.io's private internal network provides optimized, secure communication between IRC services while maintaining network isolation. This network enables efficient server linking, database connectivity, and services integration without external traffic routing.