Move .env.install to docs/INSTALL.md as Markdown

docs/INSTALL.md

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+# AtomCMS — Installation Guide
+
+Follow these steps to configure your environment after cloning the repository.
+
+---
+
+## Step 1 — Choose your platform
+
+```bash
+# Linux
+cp .env.example.linux .env
+
+# Windows
+cp .env.example.windows .env
+```
+
+---
+
+## Step 2 — Generate app key
+
+```bash
+php artisan key:generate
+```
+
+---
+
+## Step 3 — Edit database settings in `.env`
+
+```
+DB_DATABASE=habbo
+DB_USERNAME=cms          # Linux: create a dedicated DB user
+DB_USERNAME=root         # Windows: default MySQL user
+DB_PASSWORD=your_secure_password
+```
+
+---
+
+## Step 4 — Set your domain
+
+```
+APP_URL=https://yourhotel.nl
+SESSION_DOMAIN=.yourhotel.nl
+SANCTUM_STATEFUL_DOMAINS=yourhotel.nl,www.yourhotel.nl
+CORS_ALLOWED_ORIGINS=https://yourhotel.nl,https://www.yourhotel.nl
+```
+
+---
+
+## Step 5 — Set to production
+
+```
+APP_ENV=production
+APP_DEBUG=false
+```
+
+---
+
+## Step 6 — (Linux only) Configure Redis
+
+```bash
+sudo apt install redis-server
+sudo systemctl enable --now redis-server
+```
+
+---
+
+## Step 7 — Run migrations
+
+```bash
+php artisan migrate --seed
+```
+
+---
+
+## Step 8 — Build frontend
+
+```bash
+yarn install && yarn build:all
+```
+
+---
+
+## Step 9 — Set permissions (Linux)
+
+```bash
+sudo chown -R www-data:www-data storage bootstrap/cache public/build
+sudo chmod -R 775 storage bootstrap/cache
+```
+
+---
+
+## Step 10 — Restart PHP-FPM (Linux)
+
+```bash
+sudo systemctl restart php8.5-fpm
+```
+
+---
+
+Your hotel is now ready at `https://yourhotel.nl`.