Release v0.4.0

Added / 新增

• Added separate public entry points flutter_rtc_link_device.dart (provisioning, OTA, logs, diagnostics, generic BLE) and flutter_rtc_link_robot.dart (teleoperation, BLE control link), so an app that only needs media no longer compiles those modules, and added tool/check_module_boundaries.dart to enforce the module directions in CI.
  • 新增独立公开入口 flutter_rtc_link_device.dart（配网、OTA、日志、诊断、通用 BLE）与 flutter_rtc_link_robot.dart（遥控、BLE 控制链路），只需要媒体能力的应用不再编译这些模块，并新增 tool/check_module_boundaries.dart 在 CI 中强制校验模块依赖方向。
• Added RobotEvent, a sealed hierarchy in robot/robot_events.dart that takes over the telemetry, pause / resume, stale-drop and watchdog events previously hanging off DeviceEvent.
  • 新增 RobotEvent（位于 robot/robot_events.dart 的密封层级），接管此前挂在 DeviceEvent 下的遥测、暂停 / 恢复、过期丢弃与看门狗事件。
• Added NfcTagBackend and WifiNetworkConnector: injectable adapters so the NFC and Wi-Fi stacks are supplied by the app instead of being forced on every consumer of the plugin.
  • 新增 NfcTagBackend 与 WifiNetworkConnector 可注入适配器，使 NFC 与 Wi-Fi 技术栈由应用提供，而不强加给插件的每个使用者。

Changed / 优化

• Changed the public barrel flutter_rtc_link.dart to export the media core only: device and robot symbols must now be imported from flutter_rtc_link_device.dart / flutter_rtc_link_robot.dart (breaking, no compatibility shim).
  • 公开 barrel flutter_rtc_link.dart 现只导出媒体核心：设备与机器人符号需改从 flutter_rtc_link_device.dart / flutter_rtc_link_robot.dart 导入（破坏性变更，无兼容垫片）。
• Changed core/ into a dependency-free shared kernel: DeviceEvent moved to device/device_events.dart, MqttCredentials to core/rtc_credentials.dart and BleDevice to ble/ble_device.dart, so core and resilience no longer depend on device, robot, ble or platforms.
  • 将 core/ 改为零依赖共享内核：DeviceEvent 迁至 device/device_events.dart、MqttCredentials 迁至 core/rtc_credentials.dart、BleDevice 迁至 ble/ble_device.dart，core 与 resilience 自此不再依赖 device、robot、ble 或 platforms。
• Changed RobotController.events to emit Stream<RobotEvent> instead of Stream<DeviceEvent>; DeviceEvent keeps only provisioning, OTA, log and diagnostics events.
  • RobotController.events 改为发出 Stream<RobotEvent> 而非 Stream<DeviceEvent>；DeviceEvent 只保留配网、OTA、日志与诊断事件。
• Changed NfcProvisioningChannelImpl to require an NfcTagBackend, and renamed WifiIotSoftApChannel to SoftApProvisioningChannelImpl with a required WifiNetworkConnector; the demo app wires both with nfc_manager and wifi_iot.
  • NfcProvisioningChannelImpl 现在要求传入 NfcTagBackend；WifiIotSoftApChannel 更名为 SoftApProvisioningChannelImpl 并要求传入 WifiNetworkConnector；示例应用用 nfc_manager 与 wifi_iot 完成接线。
• Dropped the unused nordic_dfu dependency and removed ndef_record, nfc_manager and wifi_iot from the published package, cutting four native plugin integrations (and their merged Android permissions) from every install.
  • 移除未使用的 nordic_dfu 依赖，并从发布包中删除 ndef_record、nfc_manager 与 wifi_iot，每次安装少引入四个原生插件（及其合并进来的 Android 权限）。