feat: funciones infra — Docker, deploy, build y health check

Funciones impuras para gestión de contenedores: docker_build_image,
docker_compose_up/down, docker_volume_create/list/remove,
generate_dockerfile, write_dockerfile, go_build_binary, health_check_http,
deploy_app y stop_app. Todas con tests unitarios donde aplica.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

functions/infra/docker_volume_list.go

@@ -0,0 +1,35 @@
+package infra
+
+import (
+	"encoding/json"
+	"fmt"
+	"os/exec"
+	"strings"
+)
+
+// DockerVolumeList lista los volumes Docker disponibles localmente.
+// Retorna un slice de maps con campos Driver, Name, Scope, Labels, Mountpoint.
+func DockerVolumeList() ([]map[string]string, error) {
+	out, err := exec.Command("docker", "volume", "ls", "--format", "{{json .}}").Output()
+	if err != nil {
+		return nil, fmt.Errorf("docker volume ls: %w", err)
+	}
+
+	if len(strings.TrimSpace(string(out))) == 0 {
+		return nil, nil
+	}
+
+	var volumes []map[string]string
+	for _, line := range splitLines(out) {
+		if len(line) == 0 {
+			continue
+		}
+		var raw map[string]string
+		if err := json.Unmarshal(line, &raw); err != nil {
+			continue
+		}
+		volumes = append(volumes, raw)
+	}
+
+	return volumes, nil
+}