refactor(doorbell-touch): add build harness with monitor agent and board-specific setup

sketches/doorbell-touch/boards/esp32-32e/install.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+# Install TFT_eSPI for esp32-32e
+set -euo pipefail
+
+DIR="$(cd "$(dirname "$0")" && pwd)"
+VENDOR_DIR="$DIR/../../vendor/esp32-32e"
+
+if [ ! -d "$VENDOR_DIR/TFT_eSPI" ]; then
+    echo "Cloning TFT_eSPI..."
+    git clone --depth 1 --branch V2.5.43 \
+        https://github.com/Bodmer/TFT_eSPI.git \
+        "$VENDOR_DIR/TFT_eSPI"
+fi
+
+cp "$DIR/tft_user_setup.h" "$VENDOR_DIR/TFT_eSPI/User_Setup.h"
+echo "[OK] TFT_eSPI vendored for esp32-32e"