enhance: カスタム絵文字にライセンス情報を付与できるように

Resolve #10091

packages/backend/src/models/entities/Emoji.ts

@@ -55,4 +55,9 @@ export class Emoji {
 		array: true, length: 128, default: '{}',
 	})
 	public aliases: string[];
+
+	@Column('varchar', {
+		length: 1024, nullable: true,
+	})
+	public license: string | null;
 }

packages/backend/src/models/json-schema/emoji.ts

@@ -59,5 +59,9 @@ export const packedEmojiDetailedSchema = {
 			type: 'string',
 			optional: false, nullable: false,
 		},
+		license: {
+			type: 'string',
+			optional: false, nullable: true,
+		},
 	},
 } as const;