doc: add a photo of the 2M-PCB23-V3.2 board

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

doc/devices/2M-PCB23-V3_2.md

@@ -8,6 +8,10 @@
 The original web interface reports this board as hardware version V3.2
 (original firmware V100.9.25, January 2026).
 
+## PCB
+
+<img src="photos/2M-PCB23-V3.2-managed/2M-PCB23-V3.2-top.jpeg" width="300" />
+
 ## Compared to V3.1
 
 The component placement matches [2M-PCB23-V3.1](2M-PCB23-V3_1.md): same