refactor: restructure project for multi-agent extensibility

- Migrate source to packages/client and packages/server directories
- Namespace all Hermes-specific code under hermes/ subdirectories
  (api/hermes/, components/hermes/, views/hermes/, stores/hermes/)
- Add hermes.* route names and /hermes/* path prefixes
- Upgrade @koa/router to v15, adapt path-to-regexp v8 syntax
- Fix proxy path rewriting: /api/hermes/v1/* → /v1/*, /api/hermes/* → /api/*
- Fix frontend API paths to match backend /api/hermes/* routes
- Fix WebSocket terminal path to /api/hermes/terminal
- Add proxyMiddleware for reliable unmatched route proxying
- Add profiles route module and hermes-cli profile commands
- Update CLAUDE.md development guide with new architecture
- Add Chinese README (README_zh.md)
- Add Web Terminal feature to README

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

packages/client/src/components/layout/ModelSelector.vue

@@ -0,0 +1,58 @@
+<script setup lang="ts">
+import { computed } from 'vue'
+import { NSelect } from 'naive-ui'
+import { useAppStore } from '@/stores/hermes/app'
+import { useI18n } from 'vue-i18n'
+
+const { t } = useI18n()
+
+const appStore = useAppStore()
+
+const options = computed(() =>
+  appStore.modelGroups.map(g => ({
+    label: g.label,
+    type: 'group' as const,
+    key: g.provider,
+    children: g.models.map(m => ({
+      label: m,
+      value: m,
+    })),
+  })),
+)
+
+function handleChange(value: string | number | Array<string | number>) {
+  if (typeof value === 'string') {
+    appStore.switchModel(value)
+  }
+}
+</script>
+
+<template>
+  <div class="model-selector">
+    <div class="model-label">{{ t('models.title') }}</div>
+    <NSelect
+      :value="appStore.selectedModel"
+      :options="options"
+      size="small"
+      @update:value="handleChange"
+    />
+  </div>
+</template>
+
+<style scoped lang="scss">
+@use '@/styles/variables' as *;
+
+.model-selector {
+  padding: 0 12px;
+  margin-bottom: 8px;
+}
+
+.model-label {
+  font-size: 11px;
+  font-weight: 600;
+  color: $text-muted;
+  text-transform: uppercase;
+  letter-spacing: 0.5px;
+  margin-bottom: 6px;
+}
+</style>