Shell Shortcuts (proxy_on, proxy_off, goto, gpu, conda autostart)

Goal: make a fresh machine behave the same across Windows / macOS / Ubuntu with a small set of commands:

• proxy_on / proxy_off: toggle terminal proxy (env vars + Git global proxy)
• goto: persistent path shortcuts (e.g. goto work)
• gpu: show NVIDIA GPU status (nvidia-smi wrapper; Windows/Ubuntu only)
• Optional: auto-activate a Conda env when a new shell starts

This skill is intentionally opinionated:

• Prefer PowerShell on Windows for the full goto experience.
• Keep everything idempotent by putting functions/scripts behind a clearly-marked block.

Defaults (edit as needed)

• HTTP/HTTPS proxy: http://127.0.0.1:7890
• SOCKS5 proxy: socks5://127.0.0.1:7890
• NO_PROXY: localhost,127.0.0.1,.qualcomm.com,*.amazonaws.com