引入二级大纲功能，新增父子节点关系及子节点排序，同时调整API与UI以支持嵌套大纲管理

frontend/src/api/chat.ts

@@ -33,6 +33,22 @@ export async function clearMessages(novelId?: number): Promise<void> {
   await http.delete('/chat/messages', { params })
 }
 
+export interface CompressResult {
+  compressed: boolean
+  reason?: string
+  error?: string
+  removed_count?: number
+  kept_count?: number
+  summary_length?: number
+}
+
+export async function compressContext(novelId?: number): Promise<CompressResult> {
+  const params: Record<string, unknown> = {}
+  if (novelId !== undefined) params.novel_id = novelId
+  const { data } = await http.post<CompressResult>('/chat/compress', null, { params })
+  return data
+}
+
 // ── 流式聊天 ──
 
 export interface TokenUsage {
@@ -59,6 +75,7 @@ export interface StreamChatOptions {
   novelId?: number
   pageContext?: string
   toolsEnabled?: boolean
+  autoApproveTools?: boolean
   // 工具审批续传
   pendingToolCalls?: PendingToolCallData[]
   assistantText?: string
@@ -67,15 +84,16 @@ export interface StreamChatOptions {
   onError: (error: string) => void
   onDone: (usage?: TokenUsage, pending?: boolean) => void
   onToolCallsPending?: (calls: PendingToolCallData[], assistantText: string) => void
+  onToolCallsAuto?: (calls: PendingToolCallData[]) => void
   onToolResult?: (info: ToolResultInfo) => void
   signal?: AbortSignal
 }
 
 export async function streamChat(options: StreamChatOptions): Promise<void> {
   const {
-    messages, novelId, pageContext, toolsEnabled,
+    messages, novelId, pageContext, toolsEnabled, autoApproveTools,
     pendingToolCalls, assistantText,
-    onChunk, onError, onDone, onToolCallsPending, onToolResult,
+    onChunk, onError, onDone, onToolCallsPending, onToolCallsAuto, onToolResult,
     signal,
   } = options
 
@@ -84,6 +102,7 @@ export async function streamChat(options: StreamChatOptions): Promise<void> {
     novel_id: novelId ?? null,
     page_context: pageContext ?? null,
     tools_enabled: toolsEnabled ?? true,
+    auto_approve_tools: autoApproveTools ?? false,
     pending_tool_calls: pendingToolCalls ?? null,
     assistant_text: assistantText ?? null,
   })
@@ -133,6 +152,9 @@ export async function streamChat(options: StreamChatOptions): Promise<void> {
           if (event.tool_calls_pending && onToolCallsPending) {
             onToolCallsPending(event.tool_calls_pending, event.assistant_text ?? '')
           }
+          if (event.tool_calls_auto && onToolCallsAuto) {
+            onToolCallsAuto(event.tool_calls_auto)
+          }
           if (event.tool_result && onToolResult) {
             onToolResult(event.tool_result)
           }