feat: add dynamic Fuse.js options loading for template filtering (#7822)

## Summary

PRD:
https://www.notion.so/comfy-org/Implement-Move-search-config-to-templates-repo-for-template-owner-adjustability-2c76d73d365081ad81c4ed33332eda09

Move search config to templates repo for template owner adjustability

## Changes

- **What**: 
- Made `fuseOptions` reactive in `useTemplateFiltering` composable to
support dynamic updates
- Added `getFuseOptions()` API method to fetch Fuse.js configuration
from `/templates/fuse_options.json`
- Added `loadFuseOptions()` function to `useTemplateFiltering` that
fetches and applies server-provided options
- Removed unused `templateFuse` computed property from
`workflowTemplatesStore`
- Added comprehensive unit tests covering success, null response, error
handling, and Fuse instance recreation scenarios

- **Breaking**: None

- **Dependencies**: None (uses existing `fuse.js` and `axios`
dependencies)

## Review Focus

- Verify that the API endpoint path `/templates/fuse_options.json` is
correct and accessible
- Confirm that the reactive `fuseOptions` properly triggers Fuse
instance recreation when updated
- Check that error handling gracefully falls back to default options
when server fetch fails
- Ensure the watch on `fuseOptions` is necessary or can be removed
(currently just recreates Fuse via computed)
- Review test coverage to ensure all edge cases are handled

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7822-feat-add-dynamic-Fuse-js-options-loading-for-template-filtering-2db6d73d365081828103d8ee70844b2e)
by [Unito](https://www.unito.io)

---------

Co-authored-by: GitHub Action <action@github.com>

src/scripts/api.ts

@@ -10,7 +10,10 @@ import type {
 } from '@/platform/assets/schemas/assetSchema'
 import { isCloud } from '@/platform/distribution/types'
 import { useToastStore } from '@/platform/updates/common/toastStore'
-import { type WorkflowTemplates } from '@/platform/workflow/templates/types/template'
+import {
+  type TemplateInfo,
+  type WorkflowTemplates
+} from '@/platform/workflow/templates/types/template'
 import type {
   ComfyApiWorkflow,
   ComfyWorkflowJSON,
@@ -51,6 +54,7 @@ import type { useFirebaseAuthStore } from '@/stores/firebaseAuthStore'
 import type { AuthHeader } from '@/types/authTypes'
 import type { NodeExecutionId } from '@/types/nodeIdentification'
 import { fetchHistory } from '@/platform/remote/comfyui/history'
+import type { IFuseOptions } from 'fuse.js'
 
 interface QueuePromptRequestBody {
   client_id: string
@@ -1269,6 +1273,29 @@ export class ComfyApi extends EventTarget {
     }
   }
 
+  /**
+   * Gets the Fuse options from the server.
+   *
+   * @returns The Fuse options, or null if not found or invalid
+   */
+  async getFuseOptions(): Promise<IFuseOptions<TemplateInfo> | null> {
+    try {
+      const res = await axios.get(
+        this.fileURL('/templates/fuse_options.json'),
+        {
+          headers: {
+            'Content-Type': 'application/json'
+          }
+        }
+      )
+      const contentType = res.headers['content-type']
+      return contentType?.includes('application/json') ? res.data : null
+    } catch (error) {
+      console.error('Error loading fuse options:', error)
+      return null
+    }
+  }
+
   /**
    * Gets the custom nodes i18n data from the server.
    *