feat: 增加 ECharts 渲染与预览交互增强

- 新增可复用的 markdown-echarts 工作区，支持安全的 YAML 围栏、默认值、语义校验、错误占位和 SVG 渲染
- 将 ECharts 接入统一 Markdown、快速预览、精确预览与 PDF 链路，并复用 Mermaid 的不可跨页和超高图单页适配策略
- 默认示例加入 ECharts，增加源文本折叠、顶部文档状态、页码输入跳转与滚动同步
- 快速预览改用外层容器滚动，使滚动条与精确预览统一贴在预览区域右侧，并兼容显示缩放
- 完善 Docker 工作区复制、可配置 Compose 镜像、测试覆盖和进度文档

apps/web/tests/pdf-export.test.ts

@@ -23,6 +23,7 @@ describe("PDF 导出客户端", () => {
       blob: new Blob(["%PDF-test"]),
       fileName: "测试.pdf",
       pageCount: 1,
+      echartsErrorCount: 0,
       mermaidErrorCount: 0
     };
     const cache: CachedPdfExport = { key, result };
@@ -65,6 +66,7 @@ describe("PDF 导出客户端", () => {
       blob: new Blob(["%PDF-cached"]),
       fileName: "测试.pdf",
       pageCount: 1,
+      echartsErrorCount: 0,
       mermaidErrorCount: 0
     };
     const cache: CachedPdfExport = {
@@ -95,6 +97,7 @@ describe("PDF 导出客户端", () => {
       blob: new Blob(["%PDF-new"]),
       fileName: "测试.pdf",
       pageCount: 2,
+      echartsErrorCount: 0,
       mermaidErrorCount: 0
     };
     const requester = vi.fn(async () => result);
@@ -128,6 +131,7 @@ describe("PDF 导出客户端", () => {
           "content-disposition":
             "attachment; filename=\"document.pdf\"",
           "x-pdf-page-count": "4",
+          "x-echarts-error-count": "2",
           "x-mermaid-error-count": "1"
         }
       });
@@ -149,6 +153,7 @@ describe("PDF 导出客户端", () => {
     );
     expect(result.fileName).toBe("document.pdf");
     expect(result.pageCount).toBe(4);
+    expect(result.echartsErrorCount).toBe(2);
     expect(result.mermaidErrorCount).toBe(1);
     expect(await result.blob.text()).toBe("%PDF-test");
   });