feat: 10 funciones infra Docker y 2 tipos — operaciones de contenedores e imagenes

Funciones Docker: list/start/stop/remove containers, list/pull/remove images,
inspect, logs, run. Tipos: ContainerInfo e ImageInfo. Pre-existentes en el
dominio infra, ahora registrados.

functions/infra/docker_list_containers.md

@@ -0,0 +1,37 @@
+---
+name: docker_list_containers
+kind: function
+lang: go
+domain: infra
+version: "1.0.0"
+purity: impure
+signature: "func DockerListContainers(all bool) ([]ContainerInfo, error)"
+description: "Lista contenedores Docker locales. Si all es true incluye contenedores detenidos. Parsea la salida JSON de docker ps."
+tags: [docker, container, list, infra]
+uses_functions: []
+uses_types: [container_info_go_infra]
+returns: [container_info_go_infra]
+returns_optional: false
+error_type: "error_go_core"
+imports: [encoding/json, fmt, os/exec]
+tested: false
+tests: []
+test_file_path: ""
+file_path: "functions/infra/docker_list_containers.go"
+---
+
+## Ejemplo
+
+```go
+containers, err := DockerListContainers(true)
+if err != nil {
+    log.Fatal(err)
+}
+for _, c := range containers {
+    fmt.Printf("%s %s %s\n", c.ID, c.Name, c.Status)
+}
+```
+
+## Notas
+
+Usa `docker ps --format '{{json .}}'` para parsear la salida de forma confiable. Incluye helpers internos `splitLines` y `parseLabels`.