feat: 公开定时任务页面、Word 导出、定时任务实时刷新与技能详情重构

- 新增 /public/scheduled-tasks/:taskId 公开只读访问页与对应的
  /api/public/scheduled-tasks 后端路由（无需登录）
- 新增对话整体 / 单条消息 / Markdown 工件 "另存为 Word (.docx)" 能力
- 定时任务列表与运行列表在任务执行中自动轮询刷新，并新增"正在执行"标记
- 定时任务运行消息接口在事件存储为空时回退到 LangGraph checkpoint，
  让正在执行的任务也能立即看到提示词与流式输出
- 技能详情对话框由折叠面板改为 Tab 切换（Detail / SKILL.md），
  并支持 Rendered / Raw 切换、一键复制
- config.yaml 增加 database (MySQL) 与 checkpointer (SQLite) 配置块

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

frontend-web/src/core/threads/export.ts

@@ -1,5 +1,7 @@
 import type { Message } from "@langchain/langgraph-sdk";
 
+import { downloadMarkdownAsDocx } from "@/core/scheduled-tasks/markdown-docx";
+
 import {
   extractContentFromMessage,
   extractReasoningContentFromMessage,
@@ -138,3 +140,17 @@ export function exportThreadAsJSON(thread: AgentThread, messages: Message[]) {
   const filename = `${sanitizeFilename(titleOfThread(thread))}.json`;
   downloadAsFile(json, filename, "application/json;charset=utf-8");
 }
+
+/**
+ * Export the conversation as a Word document (.docx). The whole thread is
+ * serialised to Markdown first (same formatter the `.md` export uses), and
+ * then converted to a docx Blob in the browser via `markdownToDocxBlob`.
+ */
+export async function exportThreadAsWord(
+  thread: AgentThread,
+  messages: Message[],
+): Promise<void> {
+  const markdown = formatThreadAsMarkdown(thread, messages);
+  const title = titleOfThread(thread);
+  await downloadMarkdownAsDocx(markdown, sanitizeFilename(title), title);
+}