feat: sensitive channel (#11438)

* feat(backend): add isSensitive to Channel

* feat(backend): support isSensitive in channel endpoints

* feat(frontend/channel-editor): support isSensitive in create/edit channel page

* feat(frontend/channel): show sensitive indicator for sensitive channels

* docs(changelog): add チャンネルをセンシティブ指定できるようになりました

* chore: license header for each file

* chore: add isSensitive of channel to Note object

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

@@ -139,6 +139,10 @@ export const packedNoteSchema = {
 						type: 'string',
 						optional: false, nullable: true,
 					},
+					isSensitive: {
+						type: 'boolean',
+						optional: true, nullable: false,
+					}
 				},
 			},
 		},