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/components/skills/SkillList.vue

@@ -1,6 +1,9 @@
 <script setup lang="ts">
 import { ref, computed } from 'vue'
 import type { SkillCategory } from '@/api/skills'
+import { useI18n } from 'vue-i18n'
+
+const { t } = useI18n()
 
 const props = defineProps<{
   categories: SkillCategory[]
@@ -43,7 +46,7 @@ function handleSelect(category: string, skill: string) {
 <template>
   <div class="skill-list">
     <div v-if="filteredCategories.length === 0" class="skill-empty">
-      {{ searchQuery ? 'No skills match your search' : 'No skills found' }}
+      {{ searchQuery ? t('skills.noMatch') : t('skills.noSkills') }}
     </div>
     <div
       v-for="cat in filteredCategories"