Exclude channel notes from featured polls (#13838)

* feat(backend): add `channelId` to `MiPoll` as a Denormalized field

* feat(backend): option to exclude polls in channels

* chore: exclude channel notes from featured polls

* docs(changelog): みつけるのアンケート欄にてチャンネルのアンケートが含まれてしまう問題を修正

* fix: missing license header

packages/backend/src/server/api/endpoints/notes/polls/recommendation.ts

@@ -32,6 +32,7 @@ export const paramDef = {
 	properties: {
 		limit: { type: 'integer', minimum: 1, maximum: 100, default: 10 },
 		offset: { type: 'integer', default: 0 },
+		excludeChannels: { type: 'boolean', default: false },
 	},
 	required: [],
 } as const;
@@ -86,6 +87,12 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 			query.setParameters(mutingQuery.getParameters());
 			//#endregion
 
+			//#region exclude channels
+			if (ps.excludeChannels) {
+				query.andWhere('poll.channelId IS NULL');
+			}
+			//#endregion
+
 			const polls = await query
 				.orderBy('poll.noteId', 'DESC')
 				.limit(ps.limit)