[feat] Implement AssetService behind settings flag (#5404)

* [feat] add Comfy.Assets.UseAssetAPI to CORE_SETTINGS

* [feat] create AssetService

1. Add service for accessing new Asset API
2. Add fallback model paths logic so empty model directories appear for
   the user.
3. Copious tests for them all.

Co-Authored-By: Claude <noreply@anthropic.com>

* [feat] switch between assets and file paths for model data

* [feat] ignore assets with "missing" tag

* [fix] formatting and style

* [fix] call assets API with the correct filters

* [feat] elminate unused modelPath code

* [fix] remove stray comment

* [fix] model manager api was not parsed correctly

---------

Co-authored-by: Claude <noreply@anthropic.com>

src/stores/modelStore.ts

@@ -2,6 +2,8 @@ import { defineStore } from 'pinia'
 import { computed, ref } from 'vue'
 
 import { api } from '@/scripts/api'
+import { assetService } from '@/services/assetService'
+import { useSettingStore } from '@/stores/settingStore'
 
 /** (Internal helper) finds a value in a metadata object from any of a list of keys. */
 function _findInMetadata(metadata: any, ...keys: string[]): string | null {
@@ -153,7 +155,12 @@ export class ModelFolder {
   models: Record<string, ComfyModelDef> = {}
   state: ResourceState = ResourceState.Uninitialized
 
-  constructor(public directory: string) {}
+  constructor(
+    public directory: string,
+    private getModelsFunc: (
+      folder: string
+    ) => Promise<{ name: string; pathIndex: number }[]>
+  ) {}
 
   get key(): string {
     return this.directory + '/'
@@ -167,7 +174,7 @@ export class ModelFolder {
       return this
     }
     this.state = ResourceState.Loading
-    const models = await api.getModels(this.directory)
+    const models = await this.getModelsFunc(this.directory)
     for (const model of models) {
       this.models[`${model.pathIndex}/${model.name}`] = new ComfyModelDef(
         model.name,
@@ -182,6 +189,7 @@ export class ModelFolder {
 
 /** Model store handler, wraps individual per-folder model stores */
 export const useModelStore = defineStore('models', () => {
+  const settingStore = useSettingStore()
   const modelFolderNames = ref<string[]>([])
   const modelFolderByName = ref<Record<string, ModelFolder>>({})
   const modelFolders = computed<ModelFolder[]>(() =>
@@ -197,11 +205,22 @@ export const useModelStore = defineStore('models', () => {
    * Loads the model folders from the server
    */
   async function loadModelFolders() {
-    const resData = await api.getModelFolders()
+    const useAssetAPI: boolean = settingStore.get('Comfy.Assets.UseAssetAPI')
+
+    const resData = useAssetAPI
+      ? await assetService.getAssetModelFolders()
+      : await api.getModelFolders()
     modelFolderNames.value = resData.map((folder) => folder.name)
     modelFolderByName.value = {}
     for (const folderName of modelFolderNames.value) {
-      modelFolderByName.value[folderName] = new ModelFolder(folderName)
+      const getModelsFunc = useAssetAPI
+        ? (folder: string) => assetService.getAssetModels(folder)
+        : (folder: string) => api.getModels(folder)
+
+      modelFolderByName.value[folderName] = new ModelFolder(
+        folderName,
+        getModelsFunc
+      )
     }
   }