feat(sdk): 绑定时上报设备 log 到 update-metadata 并内聚双层绑定

- bind(userId:) 内聚为硬绑 + getVersion + 软绑 + updateMetadata 一次原子调用,
  软绑失败自动硬解绑回滚 + 清状态;集成方无需感知双层绑定
- fetchLatestFirmware 简化为对账上报 + checkUpgrade 两步,不再重复软绑
- VersionInfo 增加 log: [String: Any]?,走 JSONSerialization 解析(放弃 Codable);
  SDK 暴露只读 versionLog,断连/解绑/软绑回滚时清空
- ShipmentSnDeviceService 新增 updateMetadata(sn:data:),抽出 performPOST
  共享 HTTP 编排,新增 postAnyJSON 支持 [String: Any] body
- 老固件不返回 log → versionLog == nil → 自动跳过 updateMetadata,前向兼容

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Sources/DuooomiBleSDK/DuooomiBleSDK+Commands.swift

@@ -41,8 +41,10 @@ extension DuooomiBleSDK {
     /// `bind()` 内部已经在硬绑成功后自动调用一次，集成方一般不用单独调。
     ///
     /// - Parameter completion: 回调 `Result<VersionInfo, Error>`
-    ///   - 成功：`VersionInfo`（含 `version` / `type`）
+    ///   - 成功：`VersionInfo`（含 `version` / `type` / `log?`）
     ///   - 失败：`.notConnected` / `.timeout(.getDeviceVersion)` / JSON 解码错误
+    /// - Note: `log` 字段是设备返回的任意 JSON 对象，SDK 不解析其内部，存到 `sdk.versionLog`，
+    ///   `fetchLatestFirmware` 内部会透传给 shipment-sn `update-metadata` 接口。
     public func getVersion(completion: @escaping (Result<VersionInfo, Error>) -> Void) {
         guard ensureConnected(completion: completion) else { return }
         BleLog.d("Sending getDeviceVersion", "Command")
@@ -54,11 +56,14 @@ extension DuooomiBleSDK {
                 completion(.failure(error))
             case .success(let data):
                 do {
-                    let info = try self.decodeResponse(VersionInfo.self, from: data)
+                    let info = try VersionInfo.parse(from: data)
                     self.version = info.version
-                    BleLog.i("Version received: \(info.version) (type=\(info.type))", "Command")
+                    self.versionLog = info.log
+                    BleLog.i("Version received: \(info.version) (type=\(info.type), log=\(info.log != nil ? "present" : "nil"))", "Command")
                     completion(.success(info))
                 } catch {
+                    let raw = String(data: data.filter { $0 != 0 }, encoding: .utf8) ?? "<non-utf8, \(data.count) bytes>"
+                    BleLog.e("VersionInfo parse failed: \(error.localizedDescription)\nRaw: \(raw)", "Decode")
                     completion(.failure(error))
                 }
             }