refactor: remove unused GET /evaluations/feedbacks/all endpoint (#24778)

GET /evaluations/feedbacks/all returned the entire feedback table in a
single response (flagged as a Medium OOM risk for admins in
open-webui#22206). Its only frontend wrapper, getAllFeedbacks in
src/lib/apis/evaluations/index.ts, is dead: nothing imports or calls it
anywhere in the codebase. The endpoint is a redundant view-only twin of
GET /evaluations/feedbacks/all/export, which is what the admin Feedbacks
UI actually uses.

Removes the endpoint, the now-unused FeedbackResponse import in the
evaluations router, and the dead getAllFeedbacks frontend wrapper. The
shared Feedbacks.get_all_feedbacks data-layer method is kept, since the
live /feedbacks/all/export endpoint still uses it.

Ref: open-webui#22206

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/lib/apis/evaluations/index.ts

@@ -62,37 +62,6 @@ export const updateConfig = async (token: string, config: object) => {
 	return res;
 };
 
-export const getAllFeedbacks = async (token: string = '') => {
-	let error = null;
-
-	const res = await fetch(`${WEBUI_API_BASE_URL}/evaluations/feedbacks/all`, {
-		method: 'GET',
-		headers: {
-			Accept: 'application/json',
-			'Content-Type': 'application/json',
-			authorization: `Bearer ${token}`
-		}
-	})
-		.then(async (res) => {
-			if (!res.ok) throw await res.json();
-			return res.json();
-		})
-		.then((json) => {
-			return json;
-		})
-		.catch((err) => {
-			error = err.detail;
-			console.error(err);
-			return null;
-		});
-
-	if (error) {
-		throw error;
-	}
-
-	return res;
-};
-
 export const getLeaderboard = async (token: string = '', query: string = '') => {
 	let error = null;