add: custom like emoji per instance, fix like

This fixes the fact that likes on mastodon didn't get federated properly and let's instance admins choose a custom emoji

packages/backend/src/server/api/endpoints/meta.ts

@@ -84,6 +84,10 @@ export const meta = {
 				type: 'string',
 				optional: false, nullable: true,
 			},
+			defaultLike: {
+				type: 'string',
+				optional: false, nullable: true,
+			},
 			disableRegistration: {
 				type: 'boolean',
 				optional: false, nullable: false,
@@ -334,6 +338,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				// クライアントの手間を減らすためあらかじめJSONに変換しておく
 				defaultLightTheme: instance.defaultLightTheme ? JSON.stringify(JSON5.parse(instance.defaultLightTheme)) : null,
 				defaultDarkTheme: instance.defaultDarkTheme ? JSON.stringify(JSON5.parse(instance.defaultDarkTheme)) : null,
+				defaultLike: instance.defaultLike,
 				ads: ads.map(ad => ({
 					id: ad.id,
 					url: ad.url,