Add clickable keep-prompt snippets for video and image.

Co-authored-by: Cursor <cursoragent@cursor.com>

server/api/library/keep-prompts.put.ts

@@ -0,0 +1,11 @@
+import { libraryOwnerKey, publicLibrary, setKeepPrompts } from '~/server/utils/library'
+import { parseKeepPromptKind } from '~/utils/keepPrompts'
+
+export default defineEventHandler(async (event) => {
+  const body = await readBody<{ kind?: unknown; items?: unknown }>(event)
+  const kind = parseKeepPromptKind(body?.kind)
+  if (!kind) throw createError({ statusCode: 400, statusMessage: 'Kind must be video or image' })
+  const owner = libraryOwnerKey(event)
+  await setKeepPrompts(owner, kind, body?.items)
+  return publicLibrary(event)
+})