feat: インスタンスのテーマカラーを設定できるように

packages/backend/src/server/api/endpoints/admin/update-meta.ts

@@ -41,6 +41,10 @@ export const meta = {
 			validator: $.optional.nullable.arr($.str),
 		},
 
+		themeColor: {
+			validator: $.optional.nullable.str,
+		},
+
 		mascotImageUrl: {
 			validator: $.optional.nullable.str,
 		},
@@ -331,6 +335,10 @@ export default define(meta, async (ps, me) => {
 		set.blockedHosts = ps.blockedHosts.filter(Boolean);
 	}
 
+	if (ps.themeColor !== undefined) {
+		set.themeColor = ps.themeColor;
+	}
+
 	if (ps.mascotImageUrl !== undefined) {
 		set.mascotImageUrl = ps.mascotImageUrl;
 	}

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

@@ -499,6 +499,7 @@ export default define(meta, async (ps, me) => {
 		enableRecaptcha: instance.enableRecaptcha,
 		recaptchaSiteKey: instance.recaptchaSiteKey,
 		swPublickey: instance.swPublicKey,
+		themeColor: instance.themeColor,
 		mascotImageUrl: instance.mascotImageUrl,
 		bannerUrl: instance.bannerUrl,
 		errorImageUrl: instance.errorImageUrl,