fix: skip CMD_DOORBELL_SET_PAYLOAD for E340 on MiniBase Chime

[lenoxys]

Summary

• The E340 doorbell was unconditionally routed to CMD_DOORBELL_SET_PAYLOAD (1700) for livestreaming, but the MiniBase Chime station rejects this command with ERROR_INVALID_PARAM (-110)
• When the station is a MiniBase Chime, fall through to the default CMD_SET_PAYLOAD (1350) path which works correctly
• Adds isStationMiniBaseChime() helper methods (static, by-serial, and instance) for reuse

Test plan

• E340 behind MiniBase Chime: livestream should use CMD_SET_PAYLOAD and succeed
• E340 behind HomeBase 3: livestream should still use CMD_DOORBELL_SET_PAYLOAD

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Resolves homebridge-plugins/homebridge-eufy-security#877