Release v0.3.0

Added / 新增

• Persistent BLE GATT teleop control channel. / 基于 BLE GATT 的持久控制通道。
  • BleTeleopChannel implements TeleopChannel drops straight into RobotController / DualTeleopChannel — the watchdog, epoch gating and keepalive are unchanged; only the transport changes. / BleTeleopChannel implements TeleopChannel，可直接接入 RobotController / DualTeleopChannel——看门狗、epoch 门控与保活逻辑不变，仅传输换了。
  • FlutterBluePlusBleLink resolves the GATT service + command/telemetry characteristics, negotiates a larger MTU (256), subscribes to telemetry notifications, and auto-reconnects on a drop (capped, exponential backoff). / FlutterBluePlusBleLink 解析 GATT 服务与指令 / 遥测特征、协商更大 MTU（256）、订阅遥测通知，并在断线后自动重连（有上限、指数退避）。
  • BleTeleopDiscoverer scans for the teleop GATT service; BleDevice keeps the public API free of flutter_blue_plus types. Command/telemetry reuse the JSON envelopes of the other channels. / BleTeleopDiscoverer 扫描遥测 GATT 服务；BleDevice 让公开 API 不暴露 flutter_blue_plus 类型。指令 / 遥测复用其它通道的 JSON 封包。
  • Example ble_control_demo_page and website docs (ble_control.md, zh/) with the GATT contract. / 示例 ble_control_demo_page 与文档站（ble_control.md、中文版）含 GATT 契约。
• Protocol-agnostic BLE for any device (speaker, sensor, peripheral — not just robots). / 面向任意设备（音响、传感器、外设——不限于机器人）的、与协议无关的通用 BLE。
  • BleScanner discovers nearby devices with no service filter (or narrowed to serviceUuids), returning the same BleDevice the teleop path uses. / BleScanner 无需服务过滤即可发现附近设备（也可按 serviceUuids 收敛），返回与遥测路径相同的 BleDevice。
  • BleGattClient connects to a BleDevice, discovers services, and exposes raw read / write / subscribe plus a connectionState stream — no teleop / ESP contract assumed. / BleGattClient 连接 BleDevice、发现服务，并暴露原始的 read / write / subscribe 与连接状态流——不做任何遥测 / ESP 契约假设。
  • BleScanner and BleGattClient are exported from the package root and built on flutter_blue_plus, keeping exactly one Bluetooth library in the dependency tree. / BleScanner 与 BleGattClient 均从包根导出，基于 flutter_blue_plus，使依赖树中恰好只有一个蓝牙库。
  • Example ble_control_demo_page adds a Teleop / All devices toggle: "All devices" connects via BleGattClient and shows the GATT services / characteristics (tap a readable characteristic to read it). / 示例 ble_control_demo_page 新增 Teleop / All devices 切换："All devices" 经 BleGattClient 连接并展示 GATT 服务 / 特征（点击可读取的特征即可读取值）。