Updates: Model Management (#8248)

## Summary

Model management improvements: refactored tag API, enhanced UX for
trigger phrases and editing.

## Changes

### API Refactor
- Add `addAssetTags` (POST) and `removeAssetTags` (DELETE) endpoints in
assetService
- `updateAssetTags` now computes diff and calls remove/add serially
- Add `TagsOperationResult` schema; cache syncs with server response

### UX Improvements
- **Trigger phrases**: click to copy individual phrases, copy-all button
in header
- **Display name**: show edit icon on hover instead of relying on
double-click
- **Model type**: show plain text when immutable instead of disabled
select
- **Tags input**: only show edit icon on hover
- **Field labels**: updated styling to use muted foreground color
- **Optimistic update** for model type selection

---------

Co-authored-by: Amp <amp@ampcode.com>
Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>
Co-authored-by: GitHub Action <action@github.com>

src/platform/assets/components/modelInfo/ModelInfoPanel.test.ts

@@ -1,12 +1,18 @@
 import { mount } from '@vue/test-utils'
 import { createTestingPinia } from '@pinia/testing'
-import { describe, expect, it } from 'vitest'
+import { describe, expect, it, vi } from 'vitest'
 import { createI18n } from 'vue-i18n'
 
 import type { AssetDisplayItem } from '@/platform/assets/composables/useAssetBrowser'
 
 import ModelInfoPanel from './ModelInfoPanel.vue'
 
+vi.mock('@/composables/useCopyToClipboard', () => ({
+  useCopyToClipboard: () => ({
+    copyToClipboard: vi.fn()
+  })
+}))
+
 const i18n = createI18n({
   legacy: false,
   locale: 'en',