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/README.md

@@ -0,0 +1,60 @@
+# Orly Web Application
+
+This is a React web application that uses Bun for building and bundling, and is automatically embedded into the Go binary when built.
+
+## Prerequisites
+
+- [Bun](https://bun.sh/) - JavaScript runtime and toolkit
+- Go 1.16+ (for embedding functionality)
+
+## Development
+
+To run the development server:
+
+```bash
+cd app/web
+bun install
+bun run dev
+```
+
+## Building
+
+The React application needs to be built before compiling the Go binary to ensure that the embedded files are available:
+
+```bash
+# Build the React application
+cd app/web
+bun install
+bun run build
+
+# Build the Go binary from project root
+cd ../../
+go build
+```
+
+## How it works
+
+1. The React application is built to the `app/web/dist` directory
+2. The Go embed directive in `app/web.go` embeds these files into the binary
+3. When the server runs, it serves the embedded React app at the root path
+
+## Build Automation
+
+You can create a shell script to automate the build process:
+
+```bash
+#!/bin/bash
+# build.sh
+echo "Building React app..."
+cd app/web
+bun install
+bun run build
+
+echo "Building Go binary..."
+cd ../../
+go build
+
+echo "Build complete!"
+```
+
+Make it executable with `chmod +x build.sh` and run with `./build.sh`.