Refactor build and start scripts in package.json; add plugin to exclude debug files from production build in vite.config.ts; remove ConnectScreen component and replace with ConnectionPlaceholder in multiple pages; update DeviceContext to auto-connect using device IP from URL; enhance locale files with new device IP labels.

client/src/locales/data-en.json

@@ -12,7 +12,8 @@
     "powerOffConfirmCancel": "Cancel",
     "powerOffToastDemo": "Demo mode: disconnected from the device.",
     "powerOffToastSent": "Shutdown command sent.",
-    "doubleClickHint": "Double-click to enter"
+    "doubleClickHint": "Double-click to enter",
+    "backToLegacy": "Legacy version"
   },
   "vuPage": {
     "title": "VU meter gallery"
@@ -587,7 +588,7 @@
       "deviceName": "Device name",
       "firmwareVersion": "Firmware version",
       "macAddress": "MAC address",
-      "disconnect": "Disconnect"
+      "deviceIp": "Device IP"
     }
   },
   "prompt": {

client/src/locales/data-zh-HK.json

@@ -12,7 +12,8 @@
     "powerOffConfirmCancel": "取消",
     "powerOffToastDemo": "演示模式：已中斷與裝置的連線",
     "powerOffToastSent": "已傳送關機指令",
-    "doubleClickHint": "按兩下進入"
+    "doubleClickHint": "按兩下進入",
+    "backToLegacy": "返回舊版"
   },
   "vuPage": {
     "title": "VU 表庫"
@@ -403,7 +404,7 @@
       "deviceName": "裝置名稱",
       "firmwareVersion": "韌體版本",
       "macAddress": "MAC 位址",
-      "disconnect": "中斷連線"
+      "deviceIp": "裝置 IP"
     }
   },
   "prompt": {

client/src/locales/data-zh.json

@@ -12,7 +12,8 @@
     "powerOffConfirmCancel": "取消",
     "powerOffToastDemo": "演示模式：已断开与设备的连接",
     "powerOffToastSent": "已发送关机指令",
-    "doubleClickHint": "双击进入"
+    "doubleClickHint": "双击进入",
+    "backToLegacy": "返回旧版"
   },
   "vuPage": {
     "title": "VU 表库"
@@ -404,7 +405,7 @@
       "deviceName": "设备名称",
       "firmwareVersion": "固件版本",
       "macAddress": "MAC 地址",
-      "disconnect": "断开连接"
+      "deviceIp": "设备 IP"
     }
   },
   "prompt": {