Add detection system for PORT environment variable to help users configure applications correctly:
- Add detectPortFromEnvironment() method to Application model to detect PORT env var
- Add getDetectedPortInfoProperty() computed property in General Livewire component
- Display contextual info banners in UI when PORT is detected:
- Warning when PORT exists but ports_exposes is empty
- Warning when PORT doesn't match ports_exposes configuration
- Info message when PORT matches ports_exposes
- Add deployment logging to warn about PORT/ports_exposes mismatches
- Include comprehensive unit tests for port detection logic
The ports_exposes field remains authoritative for proxy configuration, while
PORT detection provides helpful suggestions to users.
