feat(beaver): 完成Task Team功能v1实现，重构后端架构支持统一内核

新增内部Task系统，包括验证、反馈门控机制，实现自动质量验证
(通过率>=0.75)和用户反馈闭环(satisfied/revise/abandon)。

实现Agent Team v1协调器，支持sequence/parallel/dag执行策略，
sub-agent复用主AgentLoop，每个run使用独立memory snapshot。

建立Skill学习pipeline，包含draft/审核/发布/回滚完整生命周期，
通过Task验证通过且用户满意才生成学习候选。

重构目录结构，移除third_party依赖，建立统一engine内核，
所有agent共享运行时基础组件。

更新ContextBuilder清理provider消息字段，增强SkillContext版本管理，
集成TaskExecutionPlanner和TaskSkillResolver实现技能解析机制。

app-instance/frontend/components/chat-workbench/MessageList.tsx

@@ -1,7 +1,7 @@
 'use client';
 
 import React from 'react';
-import { Bot, Loader2, Paperclip, User } from 'lucide-react';
+import { Bot, Loader2, Paperclip, RefreshCcw, ThumbsUp, User, XCircle } from 'lucide-react';
 
 import type { ChatMessage, ProcessArtifact, ProcessEvent, ProcessRun } from '@/types';
 import { getAccessToken, getFileUrl } from '@/lib/api';
@@ -37,7 +37,16 @@ function AuthImage({ src, alt, className }: { src: string; alt: string; classNam
   return <img src={blobUrl} alt={alt} className={className} loading="lazy" decoding="async" />;
 }
 
-function MessageBubble({ message }: { message: ChatMessage }) {
+function MessageBubble({
+  message,
+  canSendFeedback,
+  onFeedback,
+}: {
+  message: ChatMessage;
+  canSendFeedback: boolean;
+  onFeedback: (runId: string, feedbackType: 'satisfied' | 'revise' | 'abandon') => void;
+}) {
+  const { locale } = useAppI18n();
   const isUser = message.role === 'user';
   const textContent = typeof message.content === 'string' ? message.content : String(message.content || '');
 
@@ -101,6 +110,56 @@ function MessageBubble({ message }: { message: ChatMessage }) {
         ) : (
           <MarkdownContent content={textContent} />
         )}
+        {!isUser && canSendFeedback && message.run_id && (
+          <div className="mt-3 flex flex-wrap items-center gap-2 border-t border-border/70 pt-2">
+            {message.feedback_state ? (
+              <span className="text-xs text-muted-foreground">
+                {message.feedback_state === 'satisfied'
+                  ? pickAppText(locale, '已标记满意', 'Marked satisfied')
+                  : message.feedback_state === 'revise'
+                    ? pickAppText(locale, '已请求修改', 'Revision requested')
+                    : pickAppText(locale, '已放弃任务', 'Task abandoned')}
+              </span>
+            ) : (
+              <>
+                <button
+                  type="button"
+                  onClick={() => onFeedback(message.run_id!, 'satisfied')}
+                  className="inline-flex h-7 items-center gap-1 rounded-md border border-border px-2 text-xs text-muted-foreground hover:bg-accent hover:text-foreground"
+                >
+                  <ThumbsUp className="h-3.5 w-3.5" />
+                  {pickAppText(locale, '满意', 'Satisfied')}
+                </button>
+                <button
+                  type="button"
+                  onClick={() => onFeedback(message.run_id!, 'revise')}
+                  className="inline-flex h-7 items-center gap-1 rounded-md border border-border px-2 text-xs text-muted-foreground hover:bg-accent hover:text-foreground"
+                >
+                  <RefreshCcw className="h-3.5 w-3.5" />
+                  {pickAppText(locale, '需要修改', 'Revise')}
+                </button>
+                <button
+                  type="button"
+                  onClick={() => onFeedback(message.run_id!, 'abandon')}
+                  className="inline-flex h-7 items-center gap-1 rounded-md border border-border px-2 text-xs text-muted-foreground hover:bg-accent hover:text-foreground"
+                >
+                  <XCircle className="h-3.5 w-3.5" />
+                  {pickAppText(locale, '放弃', 'Abandon')}
+                </button>
+              </>
+            )}
+            {message.validation_status && message.validation_status !== 'unknown' && (
+              <span className="text-xs text-muted-foreground">
+                {message.validation_status === 'passed'
+                  ? pickAppText(locale, '验证通过', 'Validated')
+                  : pickAppText(locale, '验证未通过', 'Validation failed')}
+              </span>
+            )}
+            {message.feedback_error && (
+              <span className="text-xs text-destructive">{message.feedback_error}</span>
+            )}
+          </div>
+        )}
       </div>
       {isUser && (
         <div className="w-7 h-7 rounded-full bg-secondary flex items-center justify-center flex-shrink-0 mt-0.5">
@@ -198,6 +257,7 @@ export function MessageList({
   selectedRunId,
   onSelectRun,
   onCancelRun,
+  onFeedback,
 }: {
   messages: ChatMessage[];
   isThinking: boolean;
@@ -209,6 +269,7 @@ export function MessageList({
   selectedRunId: string | null;
   onSelectRun: (runId: string) => void;
   onCancelRun: (runId: string) => void;
+  onFeedback: (runId: string, feedbackType: 'satisfied' | 'revise' | 'abandon') => void;
 }) {
   const { locale } = useAppI18n();
   const visibleMessages = React.useMemo(
@@ -245,6 +306,9 @@ export function MessageList({
       return a.order - b.order;
     });
   }, [teamGroups, visibleMessages]);
+  const latestAssistantRunId = [...visibleMessages]
+    .reverse()
+    .find((message) => message.role === 'assistant' && message.run_id && message.task_id)?.run_id;
 
   return (
     <ScrollArea className="h-full px-4" viewportRef={viewportRef}>
@@ -259,7 +323,12 @@ export function MessageList({
 
         {timelineItems.map((item) =>
           item.kind === 'message' ? (
-            <MessageBubble key={item.key} message={item.message} />
+            <MessageBubble
+              key={item.key}
+              message={item.message}
+              canSendFeedback={Boolean(latestAssistantRunId && item.message.run_id === latestAssistantRunId)}
+              onFeedback={onFeedback}
+            />
           ) : (
             <AgentTeamBlock
               key={item.key}