feat(Puya-PY32F040): add OTA dual-project codegen template

Co-authored-by: Cursor <cursoragent@cursor.com>

build.bat

@@ -0,0 +1,10 @@
+@echo off
+REM One-click build for OTA firmware (Bootloader + App, two independent projects)
+REM Output -> Output\ (bootloader.hex / app.hex / app.bin ...)
+REM Both projects reference the top-level Shared\ + Drivers\ directly.
+REM Change OTA mode in Shared\ota_config.h, then re-run this script.
+cd /d "%~dp0"
+set PY=python
+where python >nul 2>nul || set PY=py
+%PY% tools\build_all.py
+pause