docs(guide): rewrite CLAUDE.md with ZCLAW-first perspective

Major changes:
- Shift from "OpenFang desktop client" to "independent AI Agent desktop app"
- Add decision principle: "Is this useful for ZCLAW? Does it affect ZCLAW?"
- Simplify project structure and tech stack sections
- Replace OpenClaw vs OpenFang comparison with unified backend approach
- Consolidate troubleshooting from scattered sections into organized FAQ
- Update Hands system documentation with 8 capabilities and status
- Stream

desktop/tailwind.config.js

@@ -13,6 +13,10 @@ export default {
           hover: 'var(--color-primary-hover)',
           light: 'var(--color-primary-light)',
         },
+        accent: {
+          DEFAULT: 'var(--color-accent)',
+          hover: 'var(--color-accent-hover)',
+        },
         success: 'var(--color-success)',
         warning: 'var(--color-warning)',
         error: 'var(--color-error)',