feat: add atomic channel profile protocol

[RCGV1]

Summary

• add a versioned, channels-only AdminMessage.ChannelProfile request with explicit REPLACE and ADD intent
• add a PSK-free completion/status response, including explicit reboot state
• advertise capability through DeviceMetadata and persist the applied profile ID/digest with ChannelFile
• add a status query so clients can verify an apply after reconnect

Constraints

• no LoRa field exists in the profile payload
• APPLY_MODE_UNSPECIFIED is invalid; UI defaults to Replace but must send it explicitly
• profile ID/digest are non-secret correlation metadata, not signature verification

Verification

• buf format --diff --exit-code
• buf lint
• buf breaking --against .git#branch=master

This is a dependency draft for firmware#11109 and the on-device event profile restore work in meshtastic/firmware#11110. Related issue: #1012.

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[RCGV1]

Closing this draft: the event-only firmware path should reuse existing channel QR add/replace semantics rather than introduce a new generic channel-profile protocol. The active work is limited to event firmware isolating its own channel and LoRa files so standard firmware naturally resumes the existing profile.