fix: 第四轮调试 — 回复去重/消息时序/UI布局/自主思考深度优化 + 文档重整

后端修复:
- main.go: 恢复 /api/v1/chat 路由中丢失的 handleChat 调用 (空响应回归)
- orchestrator.go: splitChatByLines 改为双换行分割, 避免单换行误拆
- chat_handler.go: multi_message 增加 !hasReview 守卫, 消息延迟 200→800ms
- thinker.go: RecordUserMessage 追踪活跃会话ID, 推送主动消息到正确会话
- thinker.go: 增强思考提示词 — 禁止在用户休息/离开时发送主动消息

前端修复:
- useWebSocket.ts: stream_segments 不再创建消息气泡, 消除重复回复
- MessageBubble.tsx: 动作消息居左对齐无头像, 时间戳移至气泡外侧 hover 显示
- ChatInput.tsx: 昔涟输入提示移至输入框上方, 波点动画效果
- MessageList/TypingIndicator/ChatContainer: 清理冗余 isTyping 传递
- MemoryPanel.tsx: 新增记忆面板组件

文档重整:
- docs/debug/ → docs/debug_log/ 重命名统一
- 新增 debug_log/README.md 索引
- .gitignore: 新增 android/ 排除规则

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

frontend/web/src/components/chat/MessageBubble.tsx

@@ -173,10 +173,17 @@ export function MessageBubble({
   const imageAttachments = attachments?.filter((a) => a.type === 'image') ?? [];
 
   return (
-    <div className={`flex px-4 py-2 gap-3 ${isUser ? 'justify-end' : ''}`}>
+    <div className={`flex px-4 py-2 gap-2 items-end group ${isUser ? 'justify-end' : ''}`}>
+      {/* 用户消息：时间在左侧（气泡外侧） */}
+      {isUser && !isStreaming && (
+        <p className="text-[10px] text-gray-400 dark:text-gray-500 flex-shrink-0 mb-1 hidden md:block md:opacity-0 group-hover:opacity-100 transition-opacity duration-200">
+          {time}
+        </p>
+      )}
+
       {/* 头像 */}
       {!isUser && (
-        <CyreneAvatar size="sm" className="flex-shrink-0 mt-1" />
+        <CyreneAvatar size="sm" className="flex-shrink-0 mb-0.5" />
       )}
 
       {/* 消息气泡 */}
@@ -249,22 +256,15 @@ export function MessageBubble({
             ))}
           </div>
         )}
-
-        {!isStreaming && (
-          <>
-{/* AI 消息操作栏（朗读按钮）— 暂时禁用 */}
-            {/* !isUser && <AIMessageActions content={content} /> */}
-            <p
-              className={`text-xs mt-1 ${
-                isUser ? 'text-pink-100' : 'text-gray-400'
-              }`}
-            >
-              {time}
-            </p>
-          </>
-        )}
       </div>
 
+      {/* 昔涟消息：时间在右侧（气泡外侧） */}
+      {!isUser && !isStreaming && (
+        <p className="text-[10px] text-gray-400 dark:text-gray-500 flex-shrink-0 mb-1 hidden md:block md:opacity-0 group-hover:opacity-100 transition-opacity duration-200">
+          {time}
+        </p>
+      )}
+
       {/* 用户头像 */}
       {isUser && <UserAvatar />}
 
@@ -280,7 +280,7 @@ export function MessageBubble({
   );
 }
 
-/** 动作消息气泡 — 灰色/斜体/居中，视觉上与聊天消息区分 */
+/** 动作消息气泡 — 居左，与昔涟头像对齐，灰色/斜体与聊天消息区分 */
 function ActionMessageBubble({ content, timestamp }: { content: string; timestamp: number }) {
   const time = new Date(timestamp).toLocaleTimeString('zh-CN', {
     hour: '2-digit',
@@ -288,15 +288,16 @@ function ActionMessageBubble({ content, timestamp }: { content: string; timestam
   });
 
   return (
-    <div className="flex justify-center px-4 py-1 animate-fadeIn">
-      <div className="max-w-[70%] text-center">
-        <p className="text-xs text-gray-400 dark:text-gray-500 italic leading-relaxed whitespace-pre-wrap break-words">
-          <span className="select-none text-gray-300 dark:text-gray-600">~ </span>
+    <div className="flex px-4 py-0.5 gap-1.5 items-end group animate-fadeIn">
+      <div className="w-8 flex-shrink-0" />
+      <div className="max-w-[70%]">
+        <p className="text-xs text-gray-400 dark:text-gray-500 italic leading-snug whitespace-pre-wrap break-words">
           {content}
-          <span className="select-none text-gray-300 dark:text-gray-600"> ~</span>
         </p>
-        <p className="text-[10px] text-gray-300 dark:text-gray-600 mt-0.5">{time}</p>
       </div>
+      <p className="text-[10px] text-gray-400 dark:text-gray-500 flex-shrink-0 mb-0.5 hidden md:block md:opacity-0 group-hover:opacity-100 transition-opacity duration-200">
+        {time}
+      </p>
     </div>
   );
 }