chore: 提交高层 xiaomi 封装库及示例

- 新增 xiaomi/examples/ 下 8 个示例程序（用户/家庭查询、设备列表、开关/灯光/空调控制、属性订阅、高级过滤分类、SPEC 解析）
- miot_client_sub.go: 重构 SubProp/SubEvent，使用 buildPropTopic/buildEventTopic 支持通配符订阅（siid/piid=0 → +），并修复锁顺序问题（将 RequestRefreshProp 移到 Lock 外）
- spec_parser.go: 新增 downloadSpecFile 方法，本地 SPEC 文件缺失时自动从 miot-spec.org 下载
- ARCH_PLAN.md: 架构设计从 Proposed 更新为 Accepted（v1.0→v1.1），补充设备分类/工厂/SPEC 映射等模块设计
- xiaomi/: 新增 miot 上层强类型封装模块，包含 Client 主入口、用户/家庭/设备 API、属性读写、动作调用、订阅通知，以及 devices/ 设备控制抽象（Switch/Light/AirConditioner/Fan/Cover/Humidifier/Vacuum/WaterHeater/Thermostat）和 specs/ SPEC 查询辅助
- 更多 xiaomi 示例（风扇/窗帘/传感器控制）

xiaomi/devices/vacuum.go

@@ -0,0 +1,141 @@
+package devices
+
+import (
+	"context"
+	"xiaomihome/xiaomi"
+)
+
+// Vacuum 扫地机统一控制接口
+type Vacuum interface {
+	Device
+	Start(ctx context.Context) error
+	Stop(ctx context.Context) error
+	ReturnToDock(ctx context.Context) error
+
+	SetFanLevel(ctx context.Context, level int) error
+	GetFanLevel(ctx context.Context) (int, error)
+
+	GetStatus(ctx context.Context) (VacuumStatus, error)
+}
+
+// VacuumStatus 扫地机运行状态
+type VacuumStatus struct {
+	Power    bool `json:"power"`
+	Mode     int  `json:"mode"`    // 0=idle, 1=sweep, 2=mop, 3=sweep+mop, 4=charging
+	FanLevel int  `json:"fan_level"`
+	Battery  int  `json:"battery"` // 0-100
+}
+
+type vacuumDevice struct {
+	BaseDevice
+	propOn       siidPiid // "on" — start/stop control
+	propMode     siidPiid // "mode" — 0=charge(dock), 1=sweep, etc.
+	propFanLevel siidPiid // "fan-level" (suction power)
+	propBattery  siidPiid // "battery-level"
+}
+
+// NewVacuum creates a Vacuum control for the given device.
+func NewVacuum(client *xiaomi.Client, info *xiaomi.DeviceInfo) (Vacuum, error) {
+	d := &vacuumDevice{
+		BaseDevice: NewBaseDevice(client, info),
+	}
+
+	resolver := d.getSpecResolver()
+	if resolver == nil {
+		return nil, xiaomi.ErrNoSPEC
+	}
+
+	siid, piid, ok := resolver.find("on")
+	if !ok {
+		return nil, xiaomi.ErrNotSupported
+	}
+	d.propOn = siidPiid{siid, piid, true}
+
+	if s, p, ok := resolver.find("mode"); ok {
+		d.propMode = siidPiid{s, p, true}
+	}
+	if s, p, ok := resolver.find("fan-level"); ok {
+		d.propFanLevel = siidPiid{s, p, true}
+	}
+	if s, p, ok := resolver.find("battery-level"); ok {
+		d.propBattery = siidPiid{s, p, true}
+	}
+
+	return d, nil
+}
+
+func (d *vacuumDevice) Start(ctx context.Context) error {
+	if !d.propOn.valid {
+		return xiaomi.ErrNotSupported
+	}
+	return d.SetProp(ctx, d.propOn.siid, d.propOn.piid, true)
+}
+
+func (d *vacuumDevice) Stop(ctx context.Context) error {
+	if !d.propOn.valid {
+		return xiaomi.ErrNotSupported
+	}
+	return d.SetProp(ctx, d.propOn.siid, d.propOn.piid, false)
+}
+
+func (d *vacuumDevice) ReturnToDock(ctx context.Context) error {
+	if !d.propMode.valid {
+		// Try using on=false as fallback
+		return d.Stop(ctx)
+	}
+	return d.SetProp(ctx, d.propMode.siid, d.propMode.piid, 0)
+}
+
+func (d *vacuumDevice) SetFanLevel(ctx context.Context, level int) error {
+	if !d.propFanLevel.valid {
+		return xiaomi.ErrNotSupported
+	}
+	return d.SetProp(ctx, d.propFanLevel.siid, d.propFanLevel.piid, level)
+}
+
+func (d *vacuumDevice) GetFanLevel(ctx context.Context) (int, error) {
+	if !d.propFanLevel.valid {
+		return 0, xiaomi.ErrNotSupported
+	}
+	prop, err := d.GetProp(ctx, d.propFanLevel.siid, d.propFanLevel.piid)
+	if err != nil {
+		return 0, err
+	}
+	return toInt(prop.Value), nil
+}
+
+func (d *vacuumDevice) GetStatus(ctx context.Context) (VacuumStatus, error) {
+	status := VacuumStatus{}
+
+	if d.propOn.valid {
+		prop, err := d.GetProp(ctx, d.propOn.siid, d.propOn.piid)
+		if err == nil {
+			if b, ok := prop.Value.(bool); ok {
+				status.Power = b
+			}
+		}
+	}
+
+	if d.propMode.valid {
+		prop, err := d.GetProp(ctx, d.propMode.siid, d.propMode.piid)
+		if err == nil {
+			status.Mode = toInt(prop.Value)
+		}
+	}
+
+	if d.propFanLevel.valid {
+		prop, err := d.GetProp(ctx, d.propFanLevel.siid, d.propFanLevel.piid)
+		if err == nil {
+			status.FanLevel = toInt(prop.Value)
+		}
+	}
+
+	if d.propBattery.valid {
+		prop, err := d.GetProp(ctx, d.propBattery.siid, d.propBattery.piid)
+		if err == nil {
+			status.Battery = toInt(prop.Value)
+		}
+	}
+
+	return status, nil
+}