feat(frontend): YouTube Music search, playback and playlist saving

frontend/src/routes/api/youtube/search/+server.ts

@@ -0,0 +1,27 @@
+import type { RequestHandler } from './$types';
+import { json, error } from '@sveltejs/kit';
+import { createApiClient } from '$lib/server/api';
+
+export const GET: RequestHandler = async ({ url, locals, fetch }) => {
+	if (!locals.accessToken) {
+		error(401, 'Inicia sesión para buscar.');
+	}
+
+	const query = url.searchParams.get('query')?.trim() ?? '';
+	if (!query) {
+		error(400, 'Falta el término de búsqueda.');
+	}
+
+	const continuation = url.searchParams.get('continuation') ?? undefined;
+
+	const api = createApiClient({ fetch, accessToken: locals.accessToken });
+	const { data, error: err, response } = await api.GET('/youtube/search', {
+		params: { query: { query, continuation } }
+	});
+
+	if (err || !data) {
+		error(response?.status ?? 502, 'No se pudo buscar en YouTube Music.');
+	}
+
+	return json(data);
+};

frontend/src/routes/api/youtube/tracks/[videoId]/stream/+server.ts

@@ -0,0 +1,20 @@
+import type { RequestHandler } from './$types';
+import { json, error } from '@sveltejs/kit';
+import { createApiClient } from '$lib/server/api';
+
+export const GET: RequestHandler = async ({ params, locals, fetch }) => {
+	if (!locals.accessToken) {
+		error(401, 'Inicia sesión para reproducir.');
+	}
+
+	const api = createApiClient({ fetch, accessToken: locals.accessToken });
+	const { data, error: err, response } = await api.GET('/youtube/tracks/{videoId}/stream', {
+		params: { path: { videoId: params.videoId } }
+	});
+
+	if (err || !data) {
+		error(response?.status ?? 502, 'No se pudo obtener el stream de YouTube.');
+	}
+
+	return json(data);
+};