技能展示适配持久化 + 参考文献收集与新对话流式修复

- 后端新增 skill_display_adapters 表，持久化每个技能的 display 配置与 sample
  payload；/api/skills 列表、详情、设置接口同步读写
- 新增 /api/skills/{name}/display-sample 端点，编辑器优先加载库中样例
- 前端展示适配面板改为从后端加载持久样例，无样例时提示"自动识别"
- 参考文献收集修复：仅在 bash/shell/python 等执行类工具上从参数推断技能
  名，避免 read_file / web_fetch 误匹配；引用列表纳入最新一条助手消息
- ChatBox 改用「最新 human → 最新 ai」窗口收集引用，并仅保留 citation
  模式
- 修复「新对话」点击后已发消息消失：useThreadStream 只在 threadId 切回
  空值时重置/中止 SSE，避免 onCreated 分配 id 时把刚开始的流打断；
  ChatPage 在 landing 状态隐藏 MessageList，移除 KeyedChatPage remount
- 技能详情对话框：所有者可查看源码与文件 tab（不再要求管理员）
- LocalSandbox：Windows PowerShell 5 路径下把 && 重写为 ;，并以
  UTF-8 解码 subprocess 输出，避免中文乱码
- knowledge-search-v2 mock 样例改为中文固定测试数据

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend-web/src/components/workspace/chats/chat-box.tsx

@@ -61,10 +61,14 @@ const ChatBox: React.FC<{ children: React.ReactNode; threadId: string }> = ({
     () => (settings.display.ragModeEnabled ? buildSkillDisplayMap(skills) : new Map()),
     [settings.display.ragModeEnabled, skills],
   );
-  const latestAssistant = useMemo(
-    () => findLatestAssistantMessage(thread.values.messages ?? []),
+  const latestHumanIndex = useMemo(
+    () => findLatestHumanMessageIndex(thread.values.messages ?? []),
     [thread.values.messages],
   );
+  const latestAssistant = useMemo(
+    () => findLatestAssistantMessageAfter(thread.values.messages ?? [], latestHumanIndex),
+    [latestHumanIndex, thread.values.messages],
+  );
   const displaySources = useMemo(() => {
     if (!settings.display.ragModeEnabled) {
       return [];
@@ -74,10 +78,12 @@ const ChatBox: React.FC<{ children: React.ReactNode; threadId: string }> = ({
       return [];
     }
     return collectRuntimeDisplaySources(messages, skillDisplayMap, {
-      afterMessageId: findPreviousHumanMessageId(messages, latestAssistant.id),
+      afterMessageId: latestHumanIndex >= 0 ? messages[latestHumanIndex]?.id : undefined,
       beforeMessageId: latestAssistant.id,
+      includeBeforeMessage: true,
+      includeModes: ["citation"],
     });
-  }, [settings.display.ragModeEnabled, skillDisplayMap, latestAssistant?.id, thread.values.messages]);
+  }, [settings.display.ragModeEnabled, skillDisplayMap, latestAssistant?.id, latestHumanIndex, thread.values.messages]);
   const referenceSources = useMemo(
     () => displaySources.filter((source) => source.mode === "citation"),
     [displaySources],
@@ -318,8 +324,20 @@ function ReferencePanel({
   );
 }
 
-function findLatestAssistantMessage(messages: Message[]) {
+function findLatestHumanMessageIndex(messages: Message[]) {
   for (let index = messages.length - 1; index >= 0; index--) {
+    if (messages[index]?.type === "human") {
+      return index;
+    }
+  }
+  return -1;
+}
+
+function findLatestAssistantMessageAfter(messages: Message[], afterIndex: number) {
+  for (let index = messages.length - 1; index >= 0; index--) {
+    if (afterIndex >= 0 && index <= afterIndex) {
+      return null;
+    }
     const message = messages[index];
     if (message?.type === "ai") {
       return message;
@@ -328,22 +346,4 @@ function findLatestAssistantMessage(messages: Message[]) {
   return null;
 }
 
-function findPreviousHumanMessageId(
-  messages: Message[],
-  beforeMessageId?: string,
-): string | undefined {
-  const beforeIndex =
-    beforeMessageId === undefined
-      ? messages.length
-      : messages.findIndex((message) => message.id === beforeMessageId);
-  const end = beforeIndex < 0 ? messages.length : beforeIndex;
-  for (let index = end - 1; index >= 0; index--) {
-    const message = messages[index];
-    if (message?.type === "human") {
-      return message.id;
-    }
-  }
-  return undefined;
-}
-
 export { ChatBox };