feat: add i18n, platform channels page, and WeChat QR login

- Add vue-i18n with auto-detect browser language and manual toggle (EN/中文)
- Move platform channels to separate page with credential management
- Support Telegram, Discord, Slack, WhatsApp, Matrix, Feishu, Weixin, WeCom
- Add WeChat QR code login (opens in browser, polls status, auto-saves)
- Write platform credentials to ~/.hermes/.env matching hermes gateway setup
- Auto restart gateway after platform config changes
- Add settings store with per-section save for all config categories
- Persist session group collapse state across navigation
- Fix pre-existing TypeScript build errors

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/views/SkillsView.vue

@@ -1,10 +1,12 @@
 <script setup lang="ts">
 import { ref, onMounted } from 'vue'
 import { NInput } from 'naive-ui'
+import { useI18n } from 'vue-i18n'
 import SkillList from '@/components/skills/SkillList.vue'
 import SkillDetail from '@/components/skills/SkillDetail.vue'
 import { fetchSkills, type SkillCategory } from '@/api/skills'
 
+const { t } = useI18n()
 const categories = ref<SkillCategory[]>([])
 const loading = ref(false)
 const selectedCategory = ref('')
@@ -33,10 +35,10 @@ function handleSelect(category: string, skill: string) {
 <template>
   <div class="skills-view">
     <header class="skills-header">
-      <h2 class="header-title">Skills</h2>
+      <h2 class="header-title">{{ t('skills.title') }}</h2>
       <NInput
         v-model:value="searchQuery"
-        placeholder="Search skills..."
+        :placeholder="t('skills.searchPlaceholder')"
         size="small"
         clearable
         class="search-input"