feat: support 17-byte ADC status from updated vendor protocol

Protocol update adds FFE4 Status format: 7×PD sensors (little-endian)
+ VBAT battery voltage (mV) + XOR checksum = 17 bytes.

- parseVendorStatus: handles 1-byte heartbeat, 17-byte ADC, 33-byte params
- handleValueChange: ADC type extracts PD array + battery % from VBAT
- Battery calculated as linear 3000mV(0%) to 4200mV(100%)
- PD data passed through status event for treatment pages
- Updated protocol doc with full byte table and old/new comparison

miniprogram/services/ble/protocol.js

@@ -197,7 +197,22 @@ function buildVendorCommand33(options) {
 function parseVendorStatus(buffer) {
   var bytes = bufferToBytes(buffer)
   if (bytes.length === 1) {
-    return { heartbeat: bytes[0], is_heartbeat: true, raw_hex: bytesToHex(bytes) }
+    return { type: 'heartbeat', heartbeat: bytes[0], is_heartbeat: true, raw_hex: bytesToHex(bytes) }
+  }
+  if (bytes.length === 17) {
+    var checksum = xorChecksum(bytes.slice(0, 16))
+    var pds = []
+    for (var p = 0; p < 7; p++) {
+      pds.push(bytes[p * 2] | (bytes[p * 2 + 1] << 8))
+    }
+    return {
+      type: 'adc',
+      is_heartbeat: false,
+      pd: pds,
+      vbat: bytes[14] | (bytes[15] << 8),
+      checksum_ok: checksum === bytes[16],
+      raw_hex: bytesToHex(bytes)
+    }
   }
   if (bytes.length === 33) {
     var ios = []
@@ -210,6 +225,7 @@ function parseVendorStatus(buffer) {
       })
     }
     return {
+      type: 'params',
       is_heartbeat: false,
       ios: ios,
       hold_time: (bytes[30] << 8) | bytes[31],
@@ -217,7 +233,7 @@ function parseVendorStatus(buffer) {
       raw_hex: bytesToHex(bytes)
     }
   }
-  return { is_heartbeat: false, raw_bytes: bytes, raw_hex: bytesToHex(bytes) }
+  return { type: 'unknown', is_heartbeat: false, raw_bytes: bytes, raw_hex: bytesToHex(bytes) }
 }
 
 // --- frame encoding/decoding ---