feat(agent): 持久化Trace并支持SSE恢复

frontend/src/contracts/index.ts

@@ -143,6 +143,10 @@ export type AgentEventType =
   | 'PermissionRequired'
   | 'Usage'
   | 'Citation'
+  | 'ModelCallStarted'
+  | 'ModelCallCompleted'
+  | 'ModelCallFailed'
+  | 'PermissionResolved'
   | 'RunCompleted'
   | 'RunFailed'
   | 'RunCancelled'
@@ -155,6 +159,24 @@ export interface AgentEvent {
   timestamp: string
 }
 
+export interface AgentTraceSummary {
+  model_calls: number
+  tool_calls: number
+  duration_ms: number
+  token_usage: number
+  errors: number
+}
+
+export interface AgentTraceResponse {
+  run_id: string
+  status: AgentRunStatus
+  items: AgentEvent[]
+  next_sequence: number
+  has_more: boolean
+  summary: AgentTraceSummary
+  config_snapshot: Record<string, unknown>
+}
+
 export interface ToolCall {
   tool_call_id: string
   name: string