refactor(ui,server): 移除冗余的 toolCalls 兼容字段

删除从 parts 中提取的冗余 toolCalls 数组：
- 移除 ToolCallInfo 类型定义
- 移除 Message.toolCalls 字段
- 移除 ToolCallsDisplay/ToolCallItem 组件
- 简化 sessions.ts 消息构建逻辑

packages/server/src/routes/sessions.ts

@@ -8,12 +8,11 @@ import { Hono } from 'hono';
 import { getSessionManager } from '../session/manager.js';
 import {
   CreateSessionInputSchema,
-  type ToolCallInfo,
   type Message,
   type MessagePart,
 } from '../types.js';
-import type { MessageInfo, Part, ToolPart, ApiPart } from '@ai-assistant/core';
-import { MessageStorage, PartStorage, partsToApiFormat, getToolInput, getToolDuration } from '@ai-assistant/core';
+import type { MessageInfo, Part, ApiPart } from '@ai-assistant/core';
+import { MessageStorage, PartStorage, partsToApiFormat } from '@ai-assistant/core';
 
 export const sessionsRouter = new Hono();
 
@@ -187,19 +186,6 @@ sessionsRouter.get('/:id/messages', async (c) => {
         .map((p) => p.text ?? '')
         .join('');
 
-      // 兼容字段：提取工具调用（使用 Core 工具函数）
-      const toolCalls: ToolCallInfo[] = parts
-        .filter((p): p is ToolPart => p.type === 'tool')
-        .map((p) => ({
-          id: p.toolCallId ?? '',
-          name: p.toolName ?? '',
-          arguments: getToolInput(p),
-          status: p.state.status,
-          result: p.state.status === 'completed' ? (p.state as { output: unknown }).output : undefined,
-          error: p.state.status === 'error' ? (p.state as { error: string }).error : undefined,
-          duration: getToolDuration(p),
-        }));
-
       messages.push({
         id: msgInfo.id,
         sessionId: msgInfo.sessionId,
@@ -207,7 +193,6 @@ sessionsRouter.get('/:id/messages', async (c) => {
         timestamp: new Date(msgInfo.createdAt).toISOString(),
         parts: messageParts,
         content: textContent || undefined,
-        toolCalls: toolCalls.length > 0 ? toolCalls : undefined,
       });
     }
 

packages/server/src/types.ts

@@ -349,19 +349,6 @@ export interface ReasoningMessagePart {
  */
 export type MessagePart = TextMessagePart | ToolMessagePart | ReasoningMessagePart;
 
-/**
- * 工具调用信息（兼容字段，合并后）
- */
-export interface ToolCallInfo {
-  id: string;
-  name: string;
-  arguments: Record<string, unknown>;
-  status: ToolStatus;
-  result?: unknown;
-  error?: string;
-  duration?: number;
-}
-
 /**
  * 消息格式（包含有序 Parts）
  *
@@ -378,8 +365,6 @@ export interface Message {
   parts: MessagePart[];
   /** 所有文本拼接（兼容字段） */
   content?: string;
-  /** 所有工具调用（兼容字段） */
-  toolCalls?: ToolCallInfo[];
   metadata?: {
     model?: string;
     stepCount?: number;