Python runtime (python-build-standalone 3.12):
- setup.bat/setup.sh download Python to app/runtime/python-*, preinstall
  requests/Pillow/pypdf/reportlab/matplotlib (idempotent)
- Windows-Start.bat, Mac-Start.command, plugin-cmd.bat prepend bundled
  Python to PATH; macOS launchers prefer bundled python over system
- --all-platforms also fetches win Python (extract only)
- fix hardcoded E:/Dev paths in keyframes/happyhorse skill scripts

Default provider OspreyAI:
- endpoint https://open.ospreyai.cn/v1/, key URL https://open.ospreyai.cn/keys,
  recharge https://open.ospreyai.cn/wallet
- server.js balance query now uses New API /v1/dashboard/billing/subscription
- default-config.json + trilingual manuals + README updated

.gitignore: ignore __pycache__/*.pyc