[bugfix] Fix enable pack functionality to use proper API endpoint (#6157)

## Summary
- Fixed issue where enabling a disabled pack incorrectly triggered
installation instead of using the dedicated enable endpoint
- Added proper `enablePack` method in the manager service layer
- Updated store and component to use the correct API call

## Problem
When users toggled a disabled pack to enable it via `PackEnableToggle`
component, the system was incorrectly calling the install endpoint with
full installation parameters instead of the simpler enable endpoint that
only requires the pack ID.

## Solution
1. **Added dedicated `enablePack` method in `comfyManagerService.ts`**:
   - Uses the `'enable'` task kind with `EnablePackParams`
   - Only requires `cnr_id` parameter (simpler than install)

2. **Updated `comfyManagerStore.ts`**:
   - Created proper `enablePack` function that queues an enable task
- Removed the incorrect aliasing where `enablePack` was pointing to
`installPack`

3. **Simplified `PackEnableToggle.vue`**:
   - Now calls `enablePack` with only required parameters (id, version)
   - Removed unnecessary installation-specific parameters

## Test plan
- [x] Enable a disabled pack and verify it uses the enable endpoint (not
install)
- [x] Confirm the pack is properly enabled after the operation
- [x] Check that the task queue shows "Enabling" message (not
"Installing")
- [x] Verify existing install/uninstall functionality still works

Fixes #6154

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6157-bugfix-Fix-enable-pack-functionality-to-use-proper-API-endpoint-2926d73d3650819fa4caf1b848f99735)
by [Unito](https://www.unito.io)

---------

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

src/workbench/extensions/manager/services/comfyManagerService.ts

@@ -228,6 +228,14 @@ export const useComfyManagerService = () => {
     return queueTask('disable', params, ui_id, signal)
   }
 
+  const enablePack = async (
+    params: components['schemas']['EnablePackParams'],
+    ui_id?: string,
+    signal?: AbortSignal
+  ): Promise<null> => {
+    return queueTask('enable', params, ui_id, signal)
+  }
+
   const updatePack = async (
     params: components['schemas']['UpdatePackParams'],
     ui_id?: string,
@@ -321,7 +329,7 @@ export const useComfyManagerService = () => {
     getImportFailInfoBulk,
     installPack,
     uninstallPack,
-    enablePack: installPack, // enable is done via install
+    enablePack,
     disablePack,
     updatePack,
     updateAllPacks,