feat: editable radio settings on Manage → Radio (+ !adm radio)

[sg]

What changed

The Manage → Radio tab is now editable, reorganized top→bottom into Identity, Radio settings, Advert (moved down), Contact table (moved down), and a read-only Device info dump.

Identity — edit the node Name; a New private key field (paste 128-hex) to rotate identity. Section Save/Cancel enable only on change, with a Reboot after checkbox.

Radio settings — a Preset dropdown (US/Canada, EU 868, EU/Asia 433, ANZ) that fills freq/bw/sf/cr; individually editable Frequency / Bandwidth / SF / CR / TX power, Latitude/Longitude, and an "Include location in adverts" toggle. Same change-gated Save/Cancel + Reboot after.

Change-detection snapshots the radio's reported values into a form + pristine copy; after a save the device info is re-queried and the forms re-snapshot.

Backend

• mcbot.py: refresh_self_info() (re-query SELF_INFO after a change) and adopt_new_private_key() (rewrite cached key file + refresh in-memory identity so a restart doesn't reload the stale key).
• management.py: radio_set_name, radio_apply_settings (freq/bw/sf/cr atomic; tx/coords/loc-policy; optional reboot), radio_apply_identity / _radio_import_key, radio_reboot — all audited (radio.name/settings/identity/reboot) and surfacing the radio's ERROR. Region presets live in RADIO_PRESETS.
• webapi/routers/dbadmin.py: GET /api/radio/presets, POST /api/radio/identity, POST /api/radio/settings, POST /api/radio/reboot (all require_auth).
• commands/adm.py: !adm radio name|set|preset|location|advloc|reboot|key (DM-only, owner-gated).

Safety / notes

• Private-key import is destructive: the node gets a new pubkey → contacts must re-add the bot, old DMs stop decrypting. Web import requires a typed confirm; the bot adopts the new identity and rewrites its key file; reboot recommended.
• Radio params can isolate the node and usually need a reboot to take effect (hence the per-section Reboot checkbox); reboot briefly drops the bot's link (auto_reconnect restores it).
• Preset values: US/CA + EU868 are MeshCore's documented defaults; 433/ANZ are best-known community values — please verify. Current values used: US/CA 910.525/62.5/7/5, EU868 869.618/62.5/8/5, EU/Asia433 433.5/62.5/8/5, ANZ 915.8/62.5/7/5. Presets only fill the fields; you review before Save.

Tests

tests/test_radio_config.py (stubbed radio): name (+length guard), apply-settings all/partial/out-of-range/reboot, identity import (adopts pubkey, bad-key guards), radio-ERROR→MgmtError. Full suite (12 files) green; web-ui build clean.

Breaking changes

None — additive; existing Advert/Contact-table functionality unchanged, just relocated.