feat: initial import (exclude templates and runtime temp files)

app/static/js/README.md

@@ -0,0 +1,10 @@
+# Frontend JS Layout
+
+- `core/state.js`
+  - Shared runtime state and constant maps.
+- `main.js`
+  - Main production script: full feature logic + Vue app section.
+
+`/static/app.js` is the bootstrap entry. It only loads `core/state.js` and `main.js`.
+
+> Note: `/opt/xibao-web/app/app.js` is a legacy file and is not served by the site.