Add 11-BLE-Scanner: on-screen BLE scanner, inspector and ELM327 test

- NimBLE-Arduino 2.5.1, BLE work in a background task on core 0
- LVGL 9 UI for the round screen: device list (OBD-like devices in green),
  tap to list services/characteristics, ELM test (ATZ/ATE0/ATI/ATRV/0100)
- results saved to LittleFS /ble_log.txt; serial d/c/s commands
- shared lv_conf: Montserrat 16 and 20 enabled

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

11-BLE-Scanner/platformio.ini

@@ -0,0 +1,13 @@
+; BLE scanner / inspector / ELM327 tester with on-screen UI — JC3636W518, common settings in shared/jc3636w518.ini
+
+[platformio]
+extra_configs = ../shared/jc3636w518.ini
+
+[shared]
+dir = ../shared
+
+[env:jc3636w518]
+extends = jc3636w518
+lib_deps =
+    ${jc3636w518.lib_deps}
+    h2zero/NimBLE-Arduino@2.5.1