enhance: クライアント設定の初期値を変更できるように（簡易）

packages/backend/src/models/Meta.ts

@@ -409,6 +409,12 @@ export class MiMeta {
 	})
 	public defaultDarkTheme: string | null;
 
+	@Column('varchar', {
+		length: 8192,
+		nullable: true,
+	})
+	public defaultClientSettingOverrides: string | null;
+
 	@Column('boolean', {
 		default: false,
 	})

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

@@ -315,6 +315,10 @@ export const packedMetaDetailedOnlySchema = {
 				},
 			},
 		},
+		defaultClientSettingOverrides: {
+			type: 'string',
+			optional: false, nullable: true,
+		},
 		proxyAccountName: {
 			type: 'string',
 			optional: false, nullable: true,