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/package.json

@@ -22,6 +22,9 @@
     "tauri:build:msi:debug": "pnpm prepare:openfang-runtime && node scripts/tauri-build-bundled.mjs --debug --bundles msi",
     "test": "vitest run",
     "test:watch": "vitest",
+    "test:e2e": "playwright test --project chromium --config=tests/e2e/playwright.config.ts",
+    "test:e2e:ui": "playwright test --project chromium-ui --config=tests/e2e/playwright.config.ts --grep 'UI'",
+    "test:e2e:headed": "playwright test --project chromium-headed --headed",
     "typecheck": "tsc --noEmit"
   },
   "dependencies": {