feat: add generation trace and partial-ready workflow status

frontend/src/types/generation.ts

@@ -0,0 +1,51 @@
+export interface GenerationJobSummary {
+  id: string
+  story_id: number | null
+  output_mode: string
+  input_type: string
+  status: string
+  current_step: string
+  progress_percent: number
+  progress_label: string
+  is_terminal: boolean
+  result_snapshot: Record<string, unknown>
+  error_message: string | null
+  created_at: string
+  updated_at: string
+}
+
+export interface GenerationJobEvent {
+  id: number
+  job_id: string
+  story_id: number | null
+  event_type: string
+  status: string
+  message: string | null
+  event_metadata: Record<string, unknown>
+  created_at: string
+}
+
+export interface GenerationJobDetail extends GenerationJobSummary {
+  request_payload: Record<string, unknown>
+  events: GenerationJobEvent[]
+}
+
+export interface GenerationProviderStat {
+  capability: string
+  adapter: string
+  call_count: number
+  success_count: number
+  failure_count: number
+  avg_latency_ms: number | null
+  estimated_cost_usd: number
+}
+
+export interface GenerationProviderStats {
+  story_id: number
+  total_calls: number
+  successful_calls: number
+  failed_calls: number
+  avg_latency_ms: number | null
+  estimated_cost_usd: number
+  by_provider: GenerationProviderStat[]
+}