docs: rewrite gogcli guide as傻瓜化傻瓜手册

Simplify GOGCLI_SETUP.md and GOGCLI_SETUP_en.md into a
step-by-step傻瓜化 guide with:
- Single recommended path (no branching choices)
- Copy-pasteable commands for each step
- Expected output after each step
- Quick-fix error table
- Daily usage cheat sheet

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: hotplex-ai