Add TCP/UDP port mapping support

- Add app_ports table for storing port mappings per app
- Add Port model with CRUD operations
- Add handlers for adding/deleting port mappings
- Add ports section to app detail template
- Update Docker client to configure port bindings when creating containers
- Support both TCP and UDP protocols

internal/server/routes.go

@@ -15,6 +15,8 @@ import (
 const requestTimeout = 60 * time.Second
 
 // SetupRoutes configures all HTTP routes.
+//
+//nolint:funlen // route configuration is inherently long but straightforward
 func (s *Server) SetupRoutes() {
 	s.router = chi.NewRouter()
 
@@ -79,6 +81,10 @@ func (s *Server) SetupRoutes() {
 		// Volumes
 		r.Post("/apps/{id}/volumes", s.handlers.HandleVolumeAdd())
 		r.Post("/apps/{id}/volumes/{volumeID}/delete", s.handlers.HandleVolumeDelete())
+
+		// Ports
+		r.Post("/apps/{id}/ports", s.handlers.HandlePortAdd())
+		r.Post("/apps/{id}/ports/{portID}/delete", s.handlers.HandlePortDelete())
 	})
 
 	// Metrics endpoint (optional, with basic auth)