feat: upgrade FFE1 command to 34 bytes with control byte

Per 协议简述(3): Byte33 is now control instruction (0=IDLE, 1=scan,
2=treat), Byte34 is XOR checksum. Backward compat with 33-byte
read-back preserved. All command sites updated with correct control:
- auto-scan: control=0x01 (scan mode)
- treatment-setup: control=0x02 (treat mode)
- stopTreatment: control=0x00 (IDLE)

miniprogram/services/ble/commands.js

@@ -181,12 +181,13 @@ function startTreatment(regionMask) {
 
 function stopTreatment() {
   if (protocol.PROTOCOL_MODE === 'vendor_33') {
-    return writeRawCommand(protocol.buildVendorCommand33({
+    return writeRawCommand(protocol.buildVendorCommand({
       region_mask: 0,
       wavelength: protocol.WAVELENGTH.R,
       brightness: 0,
       current_gain: 0,
-      hold_time: 0
+      hold_time: 0,
+      control: protocol.CONTROL.IDLE
     }))
   }
   return writeCommandWithRetry(protocol.CMD.STOP, [])