BEMANI Data Counter - Split Package

Keep these files in the same folder:
- BEMANI Data Counter.exe
- NDC.exe (existing-user auto-update compatibility launcher)
- NDC_Required.pkg (large; replace only when dependencies change)
- NDC_Update.pkg (shared application code)
- BDC_Module.pkg (downloaded only when BDC tool is selected)

config.json, data, captures, and logs stay beside NDC.exe.
NDC checks https://aes.bemani.jp/bdc/update/manifest.json at startup.
