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/db/src/schema/registrations.ts

@@ -15,6 +15,8 @@ export const registration = sqliteTable(
 		artForm: text("art_form"),
 		experience: text("experience"),
 		extraQuestions: text("extra_questions"),
+		managementToken: text("management_token").unique(),
+		cancelledAt: integer("cancelled_at", { mode: "timestamp_ms" }),
 		createdAt: integer("created_at", { mode: "timestamp_ms" })
 			.default(sql`(cast(unixepoch('subsecond') * 1000 as integer))`)
 			.notNull(),
@@ -23,5 +25,6 @@ export const registration = sqliteTable(
 		index("registration_email_idx").on(table.email),
 		index("registration_artForm_idx").on(table.artForm),
 		index("registration_createdAt_idx").on(table.createdAt),
+		index("registration_managementToken_idx").on(table.managementToken),
 	],
 );