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>

functions/pipelines/docker_tui.go

@@ -6,4 +6,4 @@ package pipelines
 // Vistas: Containers, Images, Volumes, Networks, Compose.
 // Arquitectura: Elm (Model-Update-View) con tabs y state machines.
 //
-// Implementation: fn_operations/docker_tui/main.go
+// Implementation: apps/docker_tui/main.go

functions/pipelines/docker_tui.md

@@ -43,13 +43,13 @@ imports:
 tested: false
 tests: []
 test_file_path: ""
-file_path: "fn_operations/docker_tui/main.go"
+file_path: "apps/docker_tui/main.go"
 ---
 
 ## Ejemplo
 
 ```bash
-cd fn_operations/docker_tui && go run .
+cd apps/docker_tui && go run .
 ```
 
 ## Notas