feat(settings): add Ollama connection status check setting

- Add new setting to enable/disable Ollama connection status check
- Update translations for the new setting across all supported languages

src/assets/locale/zh/playground.json

@@ -25,5 +25,6 @@
         "stopStreaming": "停止流媒体",
         "knowledge": "知识"
     },
-    "sendWhenEnter": "按Enter发送"
+    "sendWhenEnter": "按Enter发送",
+    "welcome": "你好！今天我能帮你什么？"
 }

src/assets/locale/zh/settings.json

@@ -35,6 +35,9 @@
       },
       "generateTitle": {
         "label": "使用人工智能生成标题"
+      },
+      "ollamaStatus": {
+        "label": "启用或禁用Ollama连接状态检查"
       }
     },
     "sidepanelRag": {