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/platform/workflow/templates/repositories/workflowTemplatesStore.ts

@@ -1,4 +1,3 @@
-import Fuse from 'fuse.js'
 import { defineStore } from 'pinia'
 import { computed, ref, shallowRef } from 'vue'
 
@@ -250,24 +249,6 @@ export const useWorkflowTemplatesStore = defineStore(
       return filteredTemplates
     })
 
-    /**
-     * Fuse.js instance for advanced template searching and filtering
-     */
-    const templateFuse = computed(() => {
-      const fuseOptions = {
-        keys: [
-          { name: 'searchableText', weight: 0.4 },
-          { name: 'title', weight: 0.3 },
-          { name: 'name', weight: 0.2 },
-          { name: 'tags', weight: 0.1 }
-        ],
-        threshold: 0.3,
-        includeScore: true
-      }
-
-      return new Fuse(enhancedTemplates.value, fuseOptions)
-    })
-
     /**
      * Filter templates by category ID using stored filter mappings
      */
@@ -548,7 +529,6 @@ export const useWorkflowTemplatesStore = defineStore(
       groupedTemplates,
       navGroupedTemplates,
       enhancedTemplates,
-      templateFuse,
       filterTemplatesByCategory,
       isLoaded,
       loadWorkflowTemplates,