Fix Homebrew install command in README translations

[dajiaohuang]

The Quick Start block in README.md and the seven translated READMEs uses �rew install --cask agentiloop-agent. The official AgentiLoop/homebrew-tap repository currently exposes only Casks/agent.rb, whose cask token is �gent, so the documented command does not resolve.\n\nExpected: document the working tap-qualified command �rew install --cask agentiloop/tap/agent consistently across all README language variants.\n\nEvidence: https://github.com/AgentiLoop/homebrew-tap/blob/main/Casks/agent.rb\nRelated context: #29 documents the tap-qualified command.

[AgentiLoop]

The official cask is 'agentiloop-agent' through homebrew. The AgentiLoop GitHub version is not the official one. That's our repo. The two are entirely separate.

See below, the official cask installs correctly:

[AgentiLoop]

See also: https://formulae.brew.sh/cask/agentiloop-agent