feat(i18n): update chat localization strings to enhance user experience and clarity (#424)

src/i18n/locales/zh/chat.json

@@ -3,11 +3,12 @@
     "gatewayRequired": "OpenClaw 网关需要运行才能使用聊天。它将自动启动，或者您可以从设置中启动。",
     "welcome": {
         "title": "ClawX 聊天",
-        "subtitle": "您的 AI 助手已就绪。在下方开始对话。",
-        "askQuestions": "提问",
-        "askQuestionsDesc": "获取任何话题的答案",
-        "creativeTasks": "创意任务",
-        "creativeTasksDesc": "写作、头脑风暴、创意"
+        "subtitle": "我能为你做些什么？",
+        "askQuestions": "处理任务",
+        "askQuestionsDesc": "处理面向任务的请求",
+        "creativeTasks": "持续执行",
+        "creativeTasksDesc": "持续推进多步骤工作",
+        "brainstorming": "多智能体并行"
     },
     "noLogs": "（暂无日志）",
     "toolbar": {