fix: correct Waveshare touch pins (17/18/38), dynamic banner

- TOUCH_SDA=17, TOUCH_SCL=18, TOUCH_RST=38 per Waveshare schematic
- GPIO 8/9 were conflicting with LCD_B0/B3, blanking the display
- Boot banner now uses BOARD_NAME macro from BoardConfig.h

sketches/doorbell-touch-esp32-32e/doorbell-touch-esp32-32e.ino

@@ -1,5 +1,5 @@
 /*
- * KLUBHAUS ALERT v5.1 — E32R35T Edition
+ * KLUBHAUS ALERT v5.1 — " BOARD_NAME " Edition
  *
  * Target: LCDWiki E32R35T (ESP32-WROOM-32E + 3.5" ST7796S + XPT2046)
  *
@@ -36,7 +36,7 @@ void setup() {
   delay(500);
 
   Serial.println("\n========================================");
-  Serial.println(" KLUBHAUS ALERT v5.1 — E32R35T");
+  Serial.println(" KLUBHAUS ALERT v5.1 — " BOARD_NAME "");
 #if DEBUG_MODE
   Serial.println(" *** DEBUG MODE — _test topics ***");
 #endif