feat: initial setup for Meshtastic Heltec V4 node, custom CA HTTPS firmware, backups, and tooling

scripts/backup_nvs.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+PORT="${1:-/dev/cu.usbmodem1101}"
+BACKUP_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)/backups"
+TIMESTAMP="$(date +%Y%m%d_%H%M%S)"
+TARGET_FILE="${BACKUP_DIR}/nvs_backup_${TIMESTAMP}.bin"
+
+ESPTOOL_BIN="$(which esptool || which esptool.py || echo "${HOME}/.local/bin/esptool.py")"
+
+mkdir -p "$BACKUP_DIR"
+echo "Backing up NVS partition (0x9000, 0x5000) to $TARGET_FILE..."
+"$ESPTOOL_BIN" --port "$PORT" read_flash 0x9000 0x5000 "$TARGET_FILE"
+echo "NVS backup complete: $TARGET_FILE"