Embed React app and add new user authentication interface.

- Integrated a React-based web frontend into the Go server using the `embed` package, serving it from `/`.
- Added build and development scripts utilizing Bun for the React app (`package.json`, `README.md`).
- Enhanced auth interface to support better user experience and permissions (`App.jsx`, CSS updates).
- Refactored `/api/auth/login` to serve React UI, removing hardcoded HTML template.
- Implemented `/api/permissions/` with ACL support for user access management.

app/web/package.json

@@ -0,0 +1,18 @@
+{
+  "name": "orly-web",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "bun run --hot src/index.jsx",
+    "build": "bun build ./src/index.jsx --outdir ./dist --minify && cp public/index.html dist/",
+    "start": "bun run dist/index.js"
+  },
+  "dependencies": {
+    "react": "^18.2.0",
+    "react-dom": "^18.2.0"
+  },
+  "devDependencies": {
+    "bun-types": "latest"
+  }
+}