feat: 重做新手导览

按新的顺序重写 main 导览（10 个内容点，导航 + 高亮共 16 步）：
主页、登录 StarLight、侧栏公告、创建 StarLight 实例、发现内容、
皮肤选择器、实例库、实验室、下载、设置的更新页。

- onboardingConfig.ts 重写 onboardingTours.main，并新增 home-intro/
  account-login/announcement/create-starlight/settings-updates 文案；
- HomeAnnouncementEntry.vue 增加 data-onboarding-id="home-announcement"
  锚点；
- en-US / zh-CN 补齐上述新增文案。

apps/app-frontend/src/locales/en-US/index.json

@@ -5975,6 +5975,36 @@
   "app.onboarding.welcome.title": {
     "message": "Everything is ready"
   },
+  "app.onboarding.home-intro.title": {
+    "message": "Welcome home"
+  },
+  "app.onboarding.home-intro.description": {
+    "message": "This is your home page. It shows your instances, recent activity, and quick shortcuts to get playing."
+  },
+  "app.onboarding.account-login.title": {
+    "message": "Sign in to StarLight"
+  },
+  "app.onboarding.account-login.description": {
+    "message": "Sign in to the StarLight skin site here to use your StarLight players, install hosted modpacks, and sync your account."
+  },
+  "app.onboarding.announcement.title": {
+    "message": "Latest announcements"
+  },
+  "app.onboarding.announcement.description": {
+    "message": "Open the announcement entry in the sidebar to read the latest news, rules, and server notices."
+  },
+  "app.onboarding.create-starlight.title": {
+    "message": "Create a StarLight instance"
+  },
+  "app.onboarding.create-starlight.description": {
+    "message": "Use Create new instance here. A StarLight instance installs the server-selected modpack and versions, then keeps them updated before each launch."
+  },
+  "app.onboarding.settings-updates.title": {
+    "message": "Stay up to date"
+  },
+  "app.onboarding.settings-updates.description": {
+    "message": "The Updates tab controls the update channel, checks for new launcher versions, and shows the changelog."
+  },
   "app.project.curseforge.loading": {
     "message": "Loading CurseForge project…"
   },

apps/app-frontend/src/locales/zh-CN/index.json

@@ -6061,6 +6061,36 @@
   "app.onboarding.welcome.title": {
     "message": "一切就绪"
   },
+  "app.onboarding.home-intro.title": {
+    "message": "欢迎回家"
+  },
+  "app.onboarding.home-intro.description": {
+    "message": "这里是你的主页，展示你的实例、最近活动和快速开始游戏的入口。"
+  },
+  "app.onboarding.account-login.title": {
+    "message": "登录 StarLight"
+  },
+  "app.onboarding.account-login.description": {
+    "message": "在这里登录 StarLight 皮肤站，即可使用皮肤站玩家、安装托管整合包并同步你的账号。"
+  },
+  "app.onboarding.announcement.title": {
+    "message": "最新公告"
+  },
+  "app.onboarding.announcement.description": {
+    "message": "打开侧栏的公告入口，查看最新消息、服规与服务器通知。"
+  },
+  "app.onboarding.create-starlight.title": {
+    "message": "创建 StarLight 实例"
+  },
+  "app.onboarding.create-starlight.description": {
+    "message": "点击这里的“创建新实例”。StarLight 实例会安装服务器指定的整合包与版本，并在每次启动前保持更新。"
+  },
+  "app.onboarding.settings-updates.title": {
+    "message": "保持最新"
+  },
+  "app.onboarding.settings-updates.description": {
+    "message": "“更新”页用于设置更新通道、检查启动器新版本并查看更新日志。"
+  },
   "app.project.curseforge.loading": {
     "message": "正在加载 CurseForge 项目…"
   },