update docs

.gitignore

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+.env
+.env.*
+!.env.example
+
+# OS cruft
+.DS_Store
+Thumbs.db
+
+# Editor directories and files
+.vscode/*
+!.vscode/extensions.json
+.idea/
+*.swp
+*.swo
+*~

README.md

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+# radapi
+
+SARLINK FreeRADIUS management stack: a REST API over the
+FreeRADIUS schema and a web admin portal for it.
+
+```
+.
+├── backend/    FastAPI REST API over the FreeRADIUS MySQL/MariaDB schema
+└── frontend/   React + Vite admin portal (radui)
+```
+
+## Components
+
+| Dir         | What                                   | Stack                                      |
+|-------------|----------------------------------------|--------------------------------------------|
+| `backend/`  | RESTful CRUD over FreeRADIUS tables     | FastAPI, SQLAlchemy 2.0, PyMySQL, Pydantic v2 |
+| `frontend/` | Admin UI for devices and VLANs          | React 19, Vite, TypeScript, Tailwind v4    |
+
+Auth across both is a shared secret sent in the **`X-API-Key`** header — the
+frontend collects the key on a login screen and the backend validates it.
+
+## Quick start
+
+**Backend** (see [`backend/README.md`](backend/README.md) for details):
+
+```bash
+cd backend
+python3 -m venv venv
+venv/bin/pip install -r requirements.txt
+cp .env.example .env          # edit DB credentials + API_KEY
+venv/bin/uvicorn app.main:app --host 0.0.0.0 --port 8000
+```
+
+**Frontend** (see [`frontend/README.md`](frontend/README.md) for details):
+
+```bash
+cd frontend
+npm install
+VITE_API_TARGET=http://127.0.0.1:8000 npm run dev   # http://localhost:5173
+```
+
+Log in with the same value set as `API_KEY` in `backend/.env`. In dev, Vite
+proxies `/api/*` to the backend so requests stay same-origin.