consolidate sketches

sketches/doorbell-touch/BoardConfig.h

@@ -0,0 +1,18 @@
+#pragma once
+// ═══════════════════════════════════════════════════════════════════
+// Board selector — driven by build flags
+// Pass -DTARGET_E32R35T or -DTARGET_WAVESHARE_S3_43
+// ═══════════════════════════════════════════════════════════════════
+
+#if defined(TARGET_E32R35T)
+  #include "boards/board_e32r35t.h"
+
+#elif defined(TARGET_WAVESHARE_S3_43)
+  #include "boards/board_waveshare_s3.h"
+
+#else
+  // Default to E32R35T for backward compatibility with existing builds
+  #pragma message("No TARGET_* defined — defaulting to E32R35T")
+  #define TARGET_E32R35T
+  #include "boards/board_e32r35t.h"
+#endif