Add extension-frame refine and lossless anchor options.

Prefer clip anchor PNGs for handoffs, optionally run Bilateral+Flux cleanup before I2V, and save decoded last-frame anchors so sequential extensions accumulate less compression damage.

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

server/utils/jobs.ts

@@ -101,6 +101,9 @@ export interface Job {
     queueAutoRun?: boolean
     queueBudget?: number
     stopAfterCurrent?: boolean
+    refineExtensionFrame?: boolean
+    saveLosslessAnchor?: boolean
+    refinementDenoise?: number
     loraName?: string
     loraStack?: import('~/utils/loras').LoraStackItem[]
     shotLoras?: string[]