feat: add home page and refactor workspace entry UI

messages/zh/home.json

@@ -0,0 +1,15 @@
+{
+  "title": "快速开始",
+  "subtitle": "描述你想要创作的故事，AI 为你智能生成影视短剧",
+  "inputPlaceholder": "输入你的故事创意、小说片段或剧本大纲...",
+  "startCreation": "开始创作",
+  "recentProjects": "最近项目",
+  "viewAll": "查看全部项目",
+  "noProjects": "还没有项目，从上方开始你的第一个创作吧",
+  "ago": {
+    "justNow": "刚刚",
+    "minutesAgo": "{n}分钟前",
+    "hoursAgo": "{n}小时前",
+    "daysAgo": "{n}天前"
+  }
+}