新增角色管理、世界观设定、章节管理和AI工具调用功能

- 角色管理：CRUD API + 卡片网格UI，每个角色约200字描述
- 世界观设定：单篇长文编辑器，建议500字以上
- 章节管理：CRUD + 排序 API，左右分栏编辑器，单章5000字上限
- AI工具调用：支持工具审批流程和结构化工具调用
- 小说详情页新增章节、角色、世界观入口按钮

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/api/chat.ts

@@ -1,5 +1,5 @@
 import { http } from './client'
-import type { AIConfig, AIConfigSave, ChatMessageList } from '@/types/chat'
+import type { AIConfig, AIConfigSave, ChatMessageList, ToolCallEntry } from '@/types/chat'
 
 // ── AI配置 ──
 
@@ -41,27 +41,51 @@ export interface TokenUsage {
   total_tokens: number
 }
 
-export interface ContextMessage {
-  role: string
-  content: string
+export interface ToolResultInfo {
+  name: string
+  label: string
+  result: string
+}
+
+export interface PendingToolCallData {
+  id: string
+  name: string
+  label: string
+  arguments: Record<string, unknown>
 }
 
 export interface StreamChatOptions {
   messages: { role: string; content: string }[]
   novelId?: number
+  pageContext?: string
+  toolsEnabled?: boolean
+  // 工具审批续传
+  pendingToolCalls?: PendingToolCallData[]
+  assistantText?: string
+  // 回调
   onChunk: (text: string) => void
   onError: (error: string) => void
-  onDone: (usage?: TokenUsage) => void
-  onContext?: (context: ContextMessage[]) => void
+  onDone: (usage?: TokenUsage, pending?: boolean) => void
+  onToolCallsPending?: (calls: PendingToolCallData[], assistantText: string) => void
+  onToolResult?: (info: ToolResultInfo) => void
   signal?: AbortSignal
 }
 
 export async function streamChat(options: StreamChatOptions): Promise<void> {
-  const { messages, novelId, onChunk, onError, onDone, onContext, signal } = options
+  const {
+    messages, novelId, pageContext, toolsEnabled,
+    pendingToolCalls, assistantText,
+    onChunk, onError, onDone, onToolCallsPending, onToolResult,
+    signal,
+  } = options
 
   const body = JSON.stringify({
     messages,
     novel_id: novelId ?? null,
+    page_context: pageContext ?? null,
+    tools_enabled: toolsEnabled ?? true,
+    pending_tool_calls: pendingToolCalls ?? null,
+    assistant_text: assistantText ?? null,
   })
 
   const resp = await fetch('/api/chat/stream', {
@@ -95,7 +119,7 @@ export async function streamChat(options: StreamChatOptions): Promise<void> {
         try {
           const event = JSON.parse(line.slice(6))
           if (event.done) {
-            onDone(event.usage ?? undefined)
+            onDone(event.usage ?? undefined, event.pending ?? false)
             return
           }
           if (event.error) {
@@ -103,12 +127,15 @@ export async function streamChat(options: StreamChatOptions): Promise<void> {
             onDone()
             return
           }
-          if (event.context && onContext) {
-            onContext(event.context)
-          }
           if (event.content) {
             onChunk(event.content)
           }
+          if (event.tool_calls_pending && onToolCallsPending) {
+            onToolCallsPending(event.tool_calls_pending, event.assistant_text ?? '')
+          }
+          if (event.tool_result && onToolResult) {
+            onToolResult(event.tool_result)
+          }
         } catch {
           // 忽略解析错误
         }