refactor: mover apps TUI de fn_operations/ a apps/

Separa aplicaciones ejecutables (docker_tui, pipeline_launcher) de la
librería fn_operations. La carpeta apps/ contiene módulos Go independientes,
fn_operations/ queda como librería pura de models/store/operations.

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

apps/docker_tui/main.go

@@ -0,0 +1,20 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"docker-tui/app"
+
+	"github.com/lucasdataproyects/devfactory/tui"
+)
+
+func main() {
+	model := app.New()
+	result := tui.RunFullscreen(model)
+
+	if result.IsErr() {
+		fmt.Fprintf(os.Stderr, "error: %v\n", result.Error())
+		os.Exit(1)
+	}
+}