server: return report id when reporting

This can be useful when adding a feature for admins and moderators
where they will be able to immediately deal with their own report,
i.e. forwarding it to the other instance.

Changelog: Added

packages/backend/src/server/api/endpoints/users/report-abuse.ts

@@ -16,6 +16,20 @@ export const meta = {
 
 	description: 'File a report.',
 
+	res: {
+		type: 'object',
+		optional: false,
+		required: true,
+		properties: {
+			id: {
+				type: 'string',
+				format: 'misskey:id',
+				optional: false,
+				nullable: false,
+			},
+		}
+	}
+
 	errors: ['NO_SUCH_USER', 'CANNOT_REPORT_ADMIN', 'CANNOT_REPORT_YOURSELF'],
 } as const;
 
@@ -81,4 +95,6 @@ export default define(meta, paramDef, async (ps, me) => {
 				sanitizeHtml(ps.comment));
 		}
 	});
+
+	return { id: report.id };
 });