feat: add registration management with token-based access

Add management tokens to registrations allowing users to view, edit, and
cancel their registration via a unique URL. Implement email notifications
for confirmations, updates, and cancellations using nodemailer. Simplify
art forms grid from 6 to 4 items and remove trajectory links. Translate
footer links to Dutch and fix matzah spelling in info section.

packages/api/package.json

@@ -20,10 +20,12 @@
 		"@orpc/zod": "catalog:",
 		"dotenv": "catalog:",
 		"drizzle-orm": "^0.45.1",
+		"nodemailer": "^8.0.1",
 		"zod": "catalog:"
 	},
 	"devDependencies": {
 		"@kk/config": "workspace:*",
+		"@types/nodemailer": "^7.0.11",
 		"typescript": "catalog:"
 	}
 }