Phase 007: migrate every remaining view from naive-ui to Arco Design Vue

The project now has exactly one UI library. Every naive-ui component in
packages/client/src is replaced by its Arco equivalent across 24 views and
roughly 80 components, and naive-ui is dropped from package.json along with
its transitive vueuc / @css-render / vdirs / seemly dependencies.

The migration is rendering-layer only. No store logic, no API contract, and
no /chat-run payload was touched.

Three classes of leftover were invisible to `grep naive-ui` and are now
covered by tests/client/no-naive-ui.test.ts, which asserts all three:
  - dead .n-* class names in style blocks
  - dead --n-* custom properties
  - naive-ui in package.json

Notable behavioural traps handled along the way, recorded in
docs/arco-migration-rules.md:
  - a-input-password defaults to masked; passing default-visibility="false"
    would have exposed API keys in clear text
  - a-upload fires a real XHR unless auto-upload is false
  - nested Trigger components fight over the first element child, so the
    group-chat settings dropdown was flattened
  - Arco renders tooltip default-slot text inline, which was silently
    collapsing the chat and group-chat toolbars

packages/client/src/components/hermes/settings/PlatformCard.vue

@@ -1,6 +1,5 @@
 <script setup lang="ts">
 import { ref, computed } from 'vue'
-import { NTag, NAlert } from 'naive-ui'
 import { useI18n } from 'vue-i18n'
 
 const props = defineProps<{
@@ -44,16 +43,16 @@ const configured = computed(() => {
       <div class="platform-info">
         <span class="platform-icon" v-html="icon" />
         <span class="platform-name">{{ name }}</span>
-        <NTag :type="configured ? 'success' : 'default'" size="small" round>
+        <a-tag :color="configured ? 'green' : 'gray'" size="small">
           {{ configured ? t('common.configured') : t('common.notConfigured') }}
-        </NTag>
+        </a-tag>
       </div>
       <span class="expand-icon" :class="{ expanded }">&#9662;</span>
     </div>
     <div v-if="expanded" class="platform-card-body">
-      <NAlert v-if="exclusive" type="warning" :show-icon="true" class="exclusive-alert">
+      <a-alert v-if="exclusive" type="warning" :show-icon="true" class="exclusive-alert">
         {{ t('platform.exclusiveTokenWarning') }}
-      </NAlert>
+      </a-alert>
       <slot />
     </div>
   </div>