refactor: simplify setup file names

- Rename SETUP_GUIDE.md to simple-setup.md
- Rename setup-picpeak.sh to simple-setup.sh
- Update all internal references to use new filenames
- Simplify naming convention for easier understanding

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

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

.claude-flow/metrics/system-metrics.json

@@ -430,5 +430,89 @@
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 ]