Add MiniMax and PinkCherry LTX as pickable video engines, with still or text start.

Shot 1 can run text-to-video; later shots still extend from the last frame. Recommend output is also normalized into shot-script cards.

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

server/utils/jobs.ts

@@ -85,7 +85,7 @@ export interface Job {
     familyId?: string
     parentClipId?: string
     parentStillId?: string
-    workflow?: 'v1' | 'v2'
+    workflow?: import('~/utils/videoModels').VideoWorkflowId
     chainContinuing?: boolean
     passes?: { prompt: string }[]
     queueId?: string