fix: 全面修复审计问题并优化系统提示词

**崩溃/挂死修复 (5):**
- 统一 TrayManager.isQuitting 变量，修复 Cmd+Q 无法退出
- useAgentStream 闭包过期快照 → 每次 getState()
- Agnes chatStream 添加 AbortSignal.timeout
- SSE JSON.parse 添加 try-catch 保护
- Orchestrator setTools 污染 → save/restore 模式

**功能修复 (14):**
- 上下文压缩实现 (每5轮 COMPRESSING 状态)
- 修复 requestId 硬编码空串
- ConfigService.set() 保留已有 category
- MemoryManager 新增 working 类型搜索
- PromptInjectionDefender 补全 sanitize()
- Ollama: 补全 dynamicReminders + reasoningContent
- openai-format: 所有 assistant 消息保留 reasoningContent
- SSE: finish_reason 时提前 flush tool_calls
- DeepSeek thinking effort 映射注释
- Ollama done_reason load→stop
- RateLimitHook >= 边界修复
- WorkspaceService isValid 首次启动修复
- sessions:archive IPC handler
- 托盘/窗口图标路径生产环境修复

**系统提示词优化:**
- SOUL.md 存在时不显示兜底身份，原文放最前
- 兜底身份改为中文 (MetonaAI 自身描述)
- 用户文本在前，附件内容在后

**文件上传:**
- 非图片文件不再 base64 编码，保留 JSON 结构
- 用户文本优先于文件内容

**UI 修复:**
- 首页 Logo 路径修复 (public/ + 相对路径)
- TokenUsage contextWindow 动态计算 (Provider 感知)
- 切换 Provider 同步 contextWindow
- 托盘图标始终显示 Logo (状态由右键菜单展示)

src/components/chat/AssistantMessage.tsx

@@ -30,17 +30,9 @@ interface AssistantMessageProps {
 export function AssistantMessage({ message, isStreaming, streamContent }: AssistantMessageProps): React.JSX.Element {
   const content = isStreaming ? streamContent ?? '' : message.content;
   const [contextMenu, setContextMenu] = useState<{ x: number; y: number } | null>(null);
-  const sendMessage = useAgentStore((s) => s.sendMessage);
   const agentStatus = useAgentStore((s) => s.agentStatus);
 
-  const handleRegenerate = useCallback(() => {
-    const lastUserMsg = [...useAgentStore.getState().messages].reverse().find((m) => m.role === 'user');
-    if (lastUserMsg) sendMessage(lastUserMsg.content);
-  }, [sendMessage]);
-
-  const contextMenuItems = createContextMenuItems('message', { content }).map((item) =>
-    item.id === 'regenerate' ? { ...item, action: handleRegenerate } : item,
-  );
+  const contextMenuItems = createContextMenuItems('message', { content });
 
   const hasThinking = !!message.reasoningContent;
   const hasTools = !!message.toolCalls?.length;

src/components/chat/MessageList.tsx

@@ -20,7 +20,7 @@ export function MessageList(): React.JSX.Element {
     return (
       <Box sx={{ flex: 1, display: 'flex', alignItems: 'center', justifyContent: 'center' }}>
         <Box sx={{ textAlign: 'center', animation: 'fadeIn 200ms ease-out' }}>
-          <Box component="img" src="./assets/logo.png" alt="Metona" sx={{ width: 80, height: 80, mx: 'auto', mb: 2.5, borderRadius: 2 }} />
+          <Box component="img" src="./logo.png" alt="Metona" sx={{ width: 80, height: 80, mx: 'auto', mb: 2.5, borderRadius: 2 }} />
           <Typography variant="h5" sx={{ color: 'text.primary', mb: 0.5, fontWeight: 700 }}>MetonaAI Desktop</Typography>
           <Typography variant="body1" sx={{ color: 'text.secondary' }}>生产级通用 AI Agent 智能体桌面应用</Typography>
           <Typography variant="body2" sx={{ mt: 2, display: 'block', opacity: 0.6 }}>Agent 就绪 · 选择一个 Provider 开始对话</Typography>