feat(settings): filename templates for download and bulk rename (#1071)

Add per-model-type filename templates ({model_name}, {version_name},
{base_model}, {author}, {first_tag}, {hash_short}, {original_name}) so
downloaded files get informative names instead of e.g. V1.safetensors.
Empty template keeps the current filename (opt-in, off by default).

- apply template automatically after downloads; rename conflicts keep
  the original name and never fail the download
- record original_file_name in metadata on rename for traceability
- bulk apply via GET|POST /api/lm/{prefix}/apply-filename-template with
  WebSocket progress, sharing the auto-organize lock
- settings UI lives in the new Organization tab with validation, live
  preview, and per-type 'apply to library' actions

locales/es.json

@@ -681,6 +681,22 @@
                 "validTemplate": "Plantilla válida"
             }
         },
+        "filenameTemplates": {
+            "title": "[TODO: Translate] Filename Templates",
+            "help": "[TODO: Translate] Configure filenames for downloaded models per model type. Leave empty to keep the original filename. The original filename is always preserved in the model's metadata.",
+            "availablePlaceholders": "[TODO: Translate] Available placeholders:",
+            "templatePlaceholder": "[TODO: Translate] Enter filename template (e.g., {base_model}-{model_name}-{version_name})",
+            "applyButton": "[TODO: Translate] Apply to Library Now",
+            "applyHelp": "[TODO: Translate] Renames all existing files of this model type according to the template. Warning: renaming changes the relative path seen by ComfyUI loaders, so existing workflows referencing the old filename may need to be updated. The original filename is preserved in each model's metadata.",
+            "confirmApply": "[TODO: Translate] Rename all existing files of this model type according to the filename template? This changes the relative path seen by ComfyUI loaders. The original filename is preserved in each model's metadata.",
+            "emptyTemplateInfo": "[TODO: Translate] No filename template configured for this model type — original filenames are kept, nothing to apply.",
+            "validation": {
+                "keepOriginal": "[TODO: Translate] Valid (keep original filename)",
+                "invalidChars": "[TODO: Translate] Invalid characters detected (a filename cannot contain / \\ < > : \" | ? *)",
+                "invalidPlaceholder": "[TODO: Translate] Invalid placeholder: {placeholder}",
+                "validTemplate": "[TODO: Translate] Valid template"
+            }
+        },
         "exampleImages": {
             "downloadLocation": "Ubicación de descarga",
             "downloadLocationPlaceholder": "Introduce la ruta de la carpeta para imágenes de ejemplo",
@@ -913,6 +929,14 @@
                 "complete": "Auto-organización completada",
                 "error": "Error: {error}"
             },
+            "filenameTemplateProgress": {
+                "initializing": "[TODO: Translate] Initializing filename template apply...",
+                "starting": "[TODO: Translate] Applying filename template to {type}...",
+                "processing": "[TODO: Translate] Processing ({processed}/{total}) - {success} renamed, {skipped} skipped, {failures} failed",
+                "completed": "[TODO: Translate] Completed: {success} renamed, {skipped} skipped, {failures} failed",
+                "complete": "[TODO: Translate] Filename template apply complete",
+                "error": "[TODO: Translate] Error: {error}"
+            },
             "enrichHfAgent": "Enriquecer metadatos con IA"
         },
         "contextMenu": {
@@ -2311,6 +2335,9 @@
             "autoOrganizeSuccess": "Auto-organización completada exitosamente para {count} {type}",
             "autoOrganizePartialSuccess": "Auto-organización completada con {success} movidos, {failures} fallidos de un total de {total} modelos",
             "autoOrganizeFailed": "Auto-organización fallida: {error}",
+            "filenameTemplateSuccess": "[TODO: Translate] Filename template applied successfully for {count} {type}",
+            "filenameTemplatePartialSuccess": "[TODO: Translate] Filename template applied with {success} renamed, {failures} failed out of {total} models",
+            "filenameTemplateFailed": "[TODO: Translate] Applying filename template failed: {error}",
             "noModelsSelected": "No hay modelos seleccionados"
         },
         "recipes": {
@@ -2477,6 +2504,8 @@
             "mappingSaveFailed": "Error al guardar mapeos de modelo base: {message}",
             "downloadTemplatesUpdated": "Plantillas de rutas de descarga actualizadas",
             "downloadTemplatesFailed": "Error al guardar plantillas de rutas de descarga: {message}",
+            "filenameTemplatesUpdated": "[TODO: Translate] Filename templates updated",
+            "filenameTemplatesFailed": "[TODO: Translate] Failed to save filename templates: {message}",
             "recipesPathUpdated": "Ruta de almacenamiento de recetas actualizada",
             "recipesPathSaveFailed": "Error al actualizar la ruta de almacenamiento de recetas: {message}",
             "settingsUpdated": "Configuración actualizada: {setting}",