refactor: remove 17-byte FFE4 and 33-byte FFE1 legacy compat code

- Remove parseVendorStatus 17-byte branch (FFE4 is now 19 bytes)
- Remove parseVendorStatus 33-byte branch (FFE1 is now 34 bytes)
- Remove buildVendorCommand33 deprecated alias
- Remove fitting/run_state !== -1 guards in connection.js
- Update commands.js to use buildVendorCommand directly

miniprogram/services/ble/protocol.js

@@ -206,11 +206,6 @@ function buildVendorCommand(options) {
   return bytes
 }
 
-// deprecated: alias kept for backward compat, actually outputs 34 bytes
-function buildVendorCommand33(options) {
-  return buildVendorCommand(options)
-}
-
 function parseVendorStatus(buffer) {
   var bytes = bufferToBytes(buffer)
   if (bytes.length === 1) {
@@ -233,23 +228,6 @@ function parseVendorStatus(buffer) {
       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),
-      fitting: -1,
-      run_state: -1,
-      checksum_ok: checksum === bytes[16],
-      raw_hex: bytesToHex(bytes)
-    }
-  }
   if (bytes.length === 34) {
     var ios34 = []
     for (var j = 0; j < 5; j++) {
@@ -272,28 +250,6 @@ function parseVendorStatus(buffer) {
       raw_hex: bytesToHex(bytes)
     }
   }
-  if (bytes.length === 33) {
-    var ios = []
-    for (var i = 0; i < 5; i++) {
-      var off = i * 6
-      ios.push({
-        red: bytes[off], infrared: bytes[off + 1],
-        uv: bytes[off + 2], warm_yellow: bytes[off + 3],
-        gain: (bytes[off + 4] << 8) | bytes[off + 5]
-      })
-    }
-    var expected33 = xorChecksum(bytes.slice(0, 32))
-    return {
-      type: 'params',
-      is_heartbeat: false,
-      ios: ios,
-      hold_time: (bytes[30] << 8) | bytes[31],
-      control: -1,
-      checksum: bytes[32],
-      checksum_ok: expected33 === bytes[32],
-      raw_hex: bytesToHex(bytes)
-    }
-  }
   return { type: 'unknown', is_heartbeat: false, raw_bytes: bytes, raw_hex: bytesToHex(bytes) }
 }
 
@@ -417,7 +373,6 @@ module.exports = {
   hexToBytes: hexToBytes,
   bytesToHex: bytesToHex,
   buildVendorCommand: buildVendorCommand,
-  buildVendorCommand33: buildVendorCommand33,
 
   buildFrame: buildFrame,
   parseFrame: parseFrame,