merge: Show signup reason in user admin screen (resolves #1090) (!1114)

View MR for information: https://activitypub.software/TransFem-org/Sharkey/-/merge_requests/1114

Closes #1090

Approved-by: dakkar <dakkar@thenautilus.net>
Approved-by: Marie <github@yuugi.dev>

packages/backend/src/server/api/endpoints/admin/show-user.ts

@@ -221,6 +221,10 @@ export const meta = {
 					},
 				},
 			},
+			signupReason: {
+				type: 'string',
+				optional: false, nullable: true,
+			},
 		},
 	},
 } as const;