fix(auth): fix approval signups and auto-join invites (#3467)

fluxer_api/src/api/instance/InstanceConfigRepository.test.ts

@@ -936,6 +936,7 @@ function pendingRegistration(userId: string) {
 		requested_at: `2026-09-01T00:00:${userId.slice(-2)}.000Z`,
 		registration_url_id: null,
 		client_ip: '127.0.0.1',
+		invite_code: null,
 	};
 }
 

fluxer_api/src/api/instance/InstanceConfigRepository.ts

@@ -1093,6 +1093,7 @@ const StoredPendingRegistrationSchema = PendingRegistrationResponse.extend({
 	requested_at: StoredRegistrationTimestampSchema,
 	registration_url_id: StoredNullableStringSchema.pipe(StoredRegistrationUrlIdSchema.nullable()),
 	client_ip: StoredNullableStringSchema,
+	invite_code: StoredNullableStringSchema,
 }) satisfies z.ZodType<InstancePendingRegistration>;
 
 function isRegistrationUrlUsable(registrationUrl: InstanceRegistrationUrl, now: Date): boolean {