[feat] Complete network call consolidation to use consistent clients

Template Workflows:
- Replace direct fetch with api.fetchApi() for API endpoints
- Keep direct fetch for static file URLs (already using api.fileURL())

Model Exporter:
- Add logic to distinguish ComfyUI URLs from external URLs
- Use api.apiURL() for ComfyUI URLs, direct fetch for external URLs
- Maintain existing download functionality

Other files already following correct patterns:
- Upload Audio: Already using api.fetchApi()
- 3D Loading Utils: Already using api.fetchApi() (fetch call is for blob conversion)
- Download Utility: Uses direct fetch for external URLs (correct)

All network calls now use consistent client patterns where appropriate.

src/composables/useTemplateWorkflows.ts

@@ -160,12 +160,15 @@ export function useTemplateWorkflows() {
    */
   const fetchTemplateJson = async (id: string, sourceModule: string) => {
     if (sourceModule === 'default') {
-      // Default templates provided by frontend are served on this separate endpoint
-      return fetch(api.fileURL(`/templates/${id}.json`)).then((r) => r.json())
+      // Default templates provided by frontend are served as static files
+      const response = await fetch(api.fileURL(`/templates/${id}.json`))
+      return response.json()
     } else {
-      return fetch(
-        api.apiURL(`/workflow_templates/${sourceModule}/${id}.json`)
-      ).then((r) => r.json())
+      // Custom node templates served via API
+      const response = await api.fetchApi(
+        `/workflow_templates/${sourceModule}/${id}.json`
+      )
+      return response.json()
     }
   }
 

src/extensions/core/load3d/ModelExporter.ts

@@ -4,6 +4,7 @@ import { OBJExporter } from 'three/examples/jsm/exporters/OBJExporter'
 import { STLExporter } from 'three/examples/jsm/exporters/STLExporter'
 
 import { t } from '@/i18n'
+import { api } from '@/scripts/api'
 import { useToastStore } from '@/stores/toastStore'
 
 export class ModelExporter {
@@ -36,7 +37,18 @@ export class ModelExporter {
     desiredFilename: string
   ): Promise<void> {
     try {
-      const response = await fetch(url)
+      // Check if this is a ComfyUI relative URL
+      const isComfyUrl = url.startsWith('/') || url.includes('/view?')
+
+      let response: Response
+      if (isComfyUrl) {
+        // Use ComfyUI API client for internal URLs
+        response = await fetch(api.apiURL(url))
+      } else {
+        // Use direct fetch for external URLs
+        response = await fetch(url)
+      }
+
       const blob = await response.blob()
 
       const link = document.createElement('a')