Update TODO status, add CAD files and pictures, move USB port to COM18

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

platformio.ini

@@ -59,7 +59,7 @@ platform = espressif32
 board = esp32doit-devkit-v1
 ; factory = recovery app, ota_0 / ota_1 = clock firmware (see partitions.csv)
 board_build.partitions = partitions.csv
-monitor_port = COM11
+monitor_port = COM18
 
 [env:esp32]
 extends = esp32_common
@@ -81,7 +81,7 @@ upload_port = 10.1.1.198
 [env:esp32_usb]
 extends = env:esp32
 upload_protocol = esptool
-upload_port = COM11
+upload_port = COM18
 board_upload.offset_address = 0x110000
 
 ; ---------------------------------------------------------------------------
@@ -101,7 +101,7 @@ build_src_filter =
 ; ESPSERIAL: status messages are sent to the Nano like in the clock firmware
 build_flags = -D ESPSERIAL -I src/esp32
 upload_protocol = esptool
-upload_port = COM11
+upload_port = COM18
 
 ; ---------------------------------------------------------------------------
 ; Unit tests on the PC (pio test -e test_nano -e test_esp32)