Remove duplicate brew shellenv from .zprofile

brew shellenv was being executed in both .zshenv and .zprofile,
causing PATH duplication and increased shell startup time for
login shells. Keep it only in .zshenv since that file is loaded
for all shell types (login/non-login, interactive/non-interactive).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: fumiya-kume

home/.zprofile

@@ -1,10 +1,3 @@
-# Homebrew
-if [[ -x /opt/homebrew/bin/brew ]]; then
-  eval "$(/opt/homebrew/bin/brew shellenv)"
-elif [[ -x /usr/local/bin/brew ]]; then
-  eval "$(/usr/local/bin/brew shellenv)"
-fi
-
 # PATH additions
 export PATH="/Library/TeX/texbin:$PATH"
 export PATH="$HOME/Library/Application Support/JetBrains/Toolbox/scripts:$PATH"