chore: rebrand product as 省心推 and lock UI to zh-CN

Update server titles, web/desktop window/tray/document titles, login
copy, and electron build metadata to use the Chinese product name 省心推.
Drop the runtime locale switcher and en-US import — the app now ships
zh-CN only.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/admin-web/src/layouts/AppShell.vue

@@ -16,7 +16,6 @@ import { useRoute, useRouter } from "vue-router";
 import { useI18n } from "vue-i18n";
 
 import { workspaceApi } from "@/lib/api";
-import { type AppLocale, setAppLocale } from "@/i18n";
 import { useAuthStore } from "@/stores/auth";
 
 const route = useRoute();
@@ -86,22 +85,6 @@ type NavSection = {
   items: NavItem[];
 };
 
-const localeOptions = computed(() => [
-  { label: t("locale.zh-CN"), value: "zh-CN" },
-  { label: t("locale.en-US"), value: "en-US" },
-]);
-
-const currentLocale = computed({
-  get: () => locale.value as AppLocale,
-  set: (value: AppLocale) => {
-    setAppLocale(value);
-  },
-});
-
-const currentLocaleLabel = computed(() => {
-  return localeOptions.value.find((opt) => opt.value === currentLocale.value)?.label ?? "Language";
-});
-
 const navSections = computed<NavSection[]>(() => {
   const base = [
     {
@@ -220,10 +203,6 @@ function go(path: string): void {
   void router.push(path);
 }
 
-function handleLocaleChange({ key }: { key: any }): void {
-  currentLocale.value = key as AppLocale;
-}
-
 async function handleLogout(): Promise<void> {
   await authStore.logout();
   await router.replace("/login");
@@ -298,22 +277,6 @@ async function handleLogout(): Promise<void> {
         </nav>
         
         <div class="admin-header-actions">
-          <div v-if="!isMembershipBlocked" class="admin-locale-switch">
-            <a-dropdown placement="bottomRight" :trigger="['click', 'hover']">
-              <div class="locale-dropdown-trigger">
-                <GlobalOutlined class="locale-icon" />
-                <span>{{ currentLocaleLabel }}</span>
-              </div>
-              <template #overlay>
-                <a-menu :selected-keys="[currentLocale]" @click="handleLocaleChange">
-                  <a-menu-item v-for="opt in localeOptions" :key="opt.value">
-                    {{ opt.label }}
-                  </a-menu-item>
-                </a-menu>
-              </template>
-            </a-dropdown>
-          </div>
-
           <!-- Quota Indicator -->
           <div v-if="!isMembershipBlocked" class="quota-pill">
             <a-tag color="blue" :bordered="false" class="quota-pill-tag">{{ quotaSummary?.plan_name || t("shell.planFallback") }}</a-tag>
@@ -487,37 +450,6 @@ async function handleLogout(): Promise<void> {
   margin-left: auto;
 }
 
-.admin-locale-switch {
-  display: flex;
-  align-items: center;
-}
-
-.admin-locale-select {
-  width: 100px;
-}
-
-.locale-dropdown-trigger {
-  display: flex;
-  align-items: center;
-  gap: 6px;
-  padding: 4px 10px;
-  height: 32px;
-  border-radius: 6px;
-  cursor: pointer;
-  transition: all 0.2s;
-  font-size: 14px;
-  color: #141414;
-}
-
-.locale-dropdown-trigger:hover {
-  background: #f5f5f5;
-}
-
-.locale-icon {
-  font-size: 16px;
-  color: #595959;
-}
-
 .quota-pill {
   display: flex;
   align-items: center;