Config builder: bootstrap workspace package

apps/config-builder/README.md

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+# Config Builder (WIP)
+
+This workspace package will host the standalone OpenClaw config builder app.
+
+## Stack
+
+Use the same front-end stack as the existing OpenClaw web UI (`ui/`):
+
+- Vite
+- Lit
+- Plain CSS (no Next.js/Tailwind)
+
+## Planning
+
+Implementation details are tracked in `.local/config-builder-spec.md`.