fix: correct region mapping (swap left/right, swap middle/bottom) and auto-scan proceeds on timeout

Region name mapping corrected to match actual hardware IO positions:
- 0x01: 左区→右区, 0x02: 右区→左区
- 0x08: 下区→中区, 0x10: 中区→下区
Auto-scan no longer shows timeout error, proceeds to next step instead.

miniprogram/pages/treatment-setup/treatment-setup.js

@@ -3,11 +3,11 @@ Page({
   data: {
     statusBarHeight: 44,
     regions: [
-      { name: '左区', mask: 0x01, checked: true },
-      { name: '右区', mask: 0x02, checked: true },
+      { name: '右区', mask: 0x01, checked: true },
+      { name: '左区', mask: 0x02, checked: true },
       { name: '上区', mask: 0x04, checked: true },
-      { name: '下区', mask: 0x08, checked: true },
-      { name: '中区', mask: 0x10, checked: true }
+      { name: '中区', mask: 0x08, checked: true },
+      { name: '下区', mask: 0x10, checked: true }
     ],
     selectedMode: 0,
     subExpired: false,