xiaomi: fix wake method for midr doorbells

[kugaevsky]

xiaomi: fix wake method for midr doorbells

Problem

Battery doorbells are woken with a cloud RPC before connecting. The current
call uses method: "wakeup" for every .cateye. model:

const params = `{"id":1,"method":"wakeup","params":{"video":"1"}}`

On midr.cateye.sd400 (Xiaomi Smart Doorbell 4 Pro) this method times out —
the device never acks it, so the wake is a no-op and the following P2P connect
fails until the device happens to be awake.

Evidence

Same account/did, back to back against home/rpc/{did}:

method	params	cloud response
wakeup	{"video":"1"}	code: -3, message: timeout
wakeup_host	{}	code: 0, message: ok, result: ["ok"]

Fix

Select the wake method per model. midr.* doorbells use wakeup_host with
empty params; other .cateye. models keep the previous wakeup call (no
regression for e.g. loock.cateye.v02).

func wakeParams(model string) (method, params string, ok bool) {
	switch {
	case strings.HasPrefix(model, "midr."):
		return "wakeup_host", "{}", true
	case strings.Contains(model, ".cateye."):
		return "wakeup", `{"video":"1"}`, true
	}
	return "", "", false
}

Testing

Verified on real hardware (midr.cateye.sd400): the old call times out, the new
call returns ok and the device wakes. Other models are unchanged.

Only midr.* is claimed as verified; the switch is easy to extend as other
families are confirmed.