feat(mesh): Meshtastic region + shared-channel auto-provisioning (MeshCore parity)

Fresh Meshtastic radios ship region-UNSET (RF-silent) and on mismatched
channels, so nodes only ever saw themselves. Bring them to MeshCore parity
using the official Meshtastic admin API:

- Auto-provision LoRa region (set_config, AdminMessage field 34) from a new
  mesh-config `lora_region` (e.g. EU_868) when the radio's region differs.
- Auto-provision a shared primary channel (set_channel, field 33) with a
  PSK derived deterministically from channel_name, so every node converges on
  one mesh — the parity equivalent of MeshCore's named "archipelago" channel.
- Read current region/channel from want_config; only write when different
  (no reboot loop); cap attempts so a radio that won't persist can't loop.
- Active NodeInfo advert scaffolding + aggressive serial drain.

Verified on .116+.228: region+channel persist, discovery works (both see each
other as named reachable contacts), bidirectional RF + sending confirmed.
Receiving in the running driver is still under diagnosis (instrumentation added).

Also removes the unwanted `meshtastic` daemon app from the registry (it was
never meant to be a container — native driver provides system-level support):
deletes apps/meshtastic + catalog entries (app-catalog, neode-ui, releases) +
test refs. Meshtastic stays native, like MeshCore.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

neode-ui/public/catalog.json

@@ -214,31 +214,6 @@
         ]
       }
     },
-    {
-      "id": "meshtastic",
-      "title": "Meshtastic",
-      "version": "2-daily-alpine",
-      "description": "Open-source mesh networking for LoRa radios. Create decentralized communication networks.",
-      "icon": "/assets/img/app-icons/meshcore.svg",
-      "author": "Meshtastic",
-      "category": "networking",
-      "tier": "recommended",
-      "dockerImage": "docker.io/meshtastic/meshtasticd:daily-alpine",
-      "repoUrl": "https://github.com/meshtastic/firmware",
-      "containerConfig": {
-        "ports": [
-          "4403:4403"
-        ],
-        "volumes": [
-          "/var/lib/archipelago/meshtastic:/var/lib/meshtasticd"
-        ],
-        "env": [
-          "MESHTASTIC_PORT=/dev/ttyUSB0",
-          "MESHTASTIC_SERIAL=true"
-        ],
-        "notes": "Requires a LoRa radio device at /dev/ttyUSB0. The config file is rendered from the app manifest before container start."
-      }
-    },
     {
       "id": "vaultwarden",
       "title": "Vaultwarden",