feat: add bootstrap script for auto-generated credentials on fresh install

DEPLOY_INSTRUCTIONS.md

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+# Deployment Instructions
+
+## Fresh Install with Auto-Generated Credentials
+
+This deployment will automatically:
+1. Generate secure random passwords for all services
+2. Create the Directus admin user
+3. Save all credentials to a file you can retrieve
+
+### Deploy Steps:
+
+1. **In Coolify, set ONLY these environment variables:**
+   ```
+   ADMIN_EMAIL=admin@sparkplatform.local
+   DB_USER=sparkuser
+   DB_DATABASE=directus
+   ```
+
+2. **Deploy the application**
+
+3. **Retrieve your credentials:**
+   ```bash
+   docker exec <directus-container-name> cat /directus/credentials.txt
+   ```
+
+4. **Login to Directus:**
+   - URL: https://spark.jumpstartscaling.com
+   - Email: admin@sparkplatform.local
+   - Password: (from credentials.txt)
+
+### Security Note:
+All passwords are randomly generated using `openssl rand -base64` and are unique per deployment.