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/services/ble/protocol.js

@@ -312,8 +312,8 @@ function parseException(payload) {
 function getRegionName(mask) {
   var names = []
   var bits = [
-    [0x01, '左区'], [0x02, '右区'], [0x04, '上区'],
-    [0x08, '下区'], [0x10, '中区'], [0x20, '左上区'], [0x40, '右上区']
+    [0x01, '右区'], [0x02, '左区'], [0x04, '上区'],
+    [0x08, '中区'], [0x10, '下区'], [0x20, '左上区'], [0x40, '右上区']
   ]
   for (var i = 0; i < bits.length; i++) {
     if (mask & bits[i][0]) names.push(bits[i][1])