Make conversation queues mutually exclusive

packages/api-contracts/src/chats.ts

@@ -173,7 +173,7 @@ export const SellerScanFlagSchema = z.strictObject({
   conversationId: z.string(),
   username: z.string(),
   /** Which rule settled it. Everything but `ai` costs no tokens. */
-  source: z.enum(['keyword', 'domain', 'funnel', 'ai']),
+  source: z.enum(['keyword', 'domain', 'funnel', 'off-platform', 'ai']),
   reason: z.string(),
   /** Present for AI verdicts only. */
   confidence: z.number().min(0).max(1).optional(),