Split prompts into pre/prompt/post and tidy the AIGen video form.

Keep wrappers off the library mid-prompt so Use as input and Extend restore the same split, send stills to xAIGen as hidden inputs, and stop the two-column library from growing with the list.

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

server/api/library/backup-ingest.post.ts

@@ -0,0 +1,48 @@
+import { passwordAuthEnabled, privateInstanceId } from '~/server/utils/localAuth'
+import { saveStill } from '~/server/utils/library'
+
+function ingestOwner() {
+  if (passwordAuthEnabled()) return privateInstanceId()
+  return 'local'
+}
+
+function assertIngestToken(event: Parameters<typeof getHeader>[0]) {
+  const expected = String(useRuntimeConfig().backupIngestToken || process.env.BACKUP_INGEST_TOKEN || '').trim()
+  if (!expected) {
+    throw createError({ statusCode: 503, statusMessage: 'Backup ingest is not configured' })
+  }
+  const header = String(getHeader(event, 'authorization') || '')
+  if (header !== `Bearer ${expected}`) {
+    throw createError({ statusCode: 401, statusMessage: 'Unauthorized' })
+  }
+}
+
+export default defineEventHandler(async (event) => {
+  assertIngestToken(event)
+  const form = await readMultipartFormData(event)
+  if (!form?.length) throw createError({ statusCode: 400, statusMessage: 'Expected an image upload' })
+  const fields: Record<string, string> = {}
+  let image: { filename: string; data: Buffer } | null = null
+  for (const part of form) {
+    if (part.name === 'image' && part.filename && part.data?.length) {
+      image = { filename: part.filename, data: part.data }
+    } else if (part.name && part.data) {
+      fields[part.name] = part.data.toString('utf8')
+    }
+  }
+  if (!image) throw createError({ statusCode: 400, statusMessage: 'An image is required' })
+  const owner = ingestOwner()
+  const still = await saveStill({
+    ownerKey: owner,
+    folderId: 'inbox',
+    filename: image.filename,
+    data: image.data,
+    width: Number(fields.width || 0),
+    height: Number(fields.height || 0),
+    hideInput: true,
+    role: 'input',
+    name: (fields.name || '').trim().slice(0, 80) || undefined
+  })
+  if (!still) throw createError({ statusCode: 400, statusMessage: 'Backup studio already has that still' })
+  return { ok: true, id: still.id }
+})