refactor(web): 前端目录重构 — consoles/pages → layouts/features + shared

- consoles/admin/ → layouts/admin-layout/
- consoles/workbench/ → layouts/workbench-layout/ + features/chat/
- pages/ → features/ (dashboard, models, projects, not-found)
- components/ → shared/components/
- hooks/ → shared/hooks/
- utils/ → shared/utils/
- 更新所有 import 路径 (src/web/ + tests/web/)
- 更新开发文档 (README.md, frontend.md, architecture.md)

src/web/features/chat/parts/TextPart.tsx

@@ -0,0 +1,39 @@
+import { XMarkdown } from "@ant-design/x-markdown";
+import "@ant-design/x-markdown/themes/dark.css";
+import "@ant-design/x-markdown/themes/light.css";
+import { Typography } from "antd";
+
+import type { PartProps } from "./types";
+
+import { useIsDark } from "../../../shared/hooks/use-is-dark";
+import { CodeBlockWithCopy } from "./CodeBlockWithCopy";
+
+interface TextPartProps extends PartProps {
+  isStreaming: boolean;
+  role: string;
+}
+
+const xmarkdownComponents = {
+  code: CodeBlockWithCopy,
+  pre: ({ children }: { children?: React.ReactNode }) => <>{children}</>,
+};
+
+export function TextPart({ isStreaming, part, role }: TextPartProps) {
+  const text = typeof part["text"] === "string" ? part["text"] : "";
+  const isDark = useIsDark();
+
+  return (
+    <div className="part-body">
+      {role === "user" ? (
+        <Typography.Paragraph className="message-body-text">{text}</Typography.Paragraph>
+      ) : (
+        <XMarkdown
+          className={isDark ? "x-markdown-dark" : "x-markdown-light"}
+          components={xmarkdownComponents}
+          content={text}
+          streaming={{ hasNextChunk: isStreaming }}
+        />
+      )}
+    </div>
+  );
+}