Expose local scheduling failures in usage UI

frontend/src/api/dashboard.ts

@@ -151,6 +151,19 @@ export interface RequestSchedulingFailure {
   reason_summary?: string | null
   status_code?: number | null
   no_upstream_attempt?: boolean | null
+  requested_model?: string | null
+  candidate_count?: number | null
+  persisted_candidate_count?: number | null
+  skipped_candidate_count?: number | null
+  skip_reasons?: Record<string, number> | null
+  provider_hint?: {
+    id?: string | null
+    name?: string | null
+  } | null
+  endpoint_hint?: {
+    id?: string | null
+    api_format?: string | null
+  } | null
 }
 
 export interface RequestDetail {