feat: 管理端板块管理与旧版数据导入，补充部署运营文档

- 新增管理端板块管理页面与后端接口（admin_board）
- 新增旧版数据导入：legacyimport 服务、导入面板、importusers 命令行工具
- 聊天用户卡片、板块图标等 UI 组件与界面优化
- 补充 about/公告/1Panel 部署等文档
- gitignore 排除 dist/ 构建产物与 .agents/ 本地工具目录

frontend/components/home/WorkspaceNav.tsx

@@ -5,6 +5,7 @@ import { useSearchParams } from "next/navigation";
 import { PenSquare, Home, LayoutGrid, ShieldCheck } from "lucide-react";
 import type { BoardWithCount, User } from "@/lib/api";
 import { isStaff } from "@/lib/roles";
+import BoardIcon, { boardColor } from "@/components/BoardIcon";
 
 // 首页壳内板块切换：仅替换中栏帖子流，不离开工作台
 function boardHref(id: number) {
@@ -52,7 +53,7 @@ export function WorkspaceNav({ boards, user }: { boards: BoardWithCount[]; user?
 
           {boards.length > 0 ? <div className="j13-board-split" role="separator" /> : null}
 
-          {boards.map((b, i) => (
+          {boards.map((b) => (
             <Link
               key={b.id}
               href={boardHref(b.id)}
@@ -60,8 +61,8 @@ export function WorkspaceNav({ boards, user }: { boards: BoardWithCount[]; user?
               aria-current={activeBoard === b.id ? "page" : undefined}
               aria-label={`${b.name}板块，${b.post_count} 篇讨论`}
             >
-              <span className={`av-${i % 8} j13-bcard-ico`} aria-hidden="true">
-                {b.name.slice(0, 1)}
+              <span className={`av-${boardColor(b)} j13-bcard-ico`} aria-hidden="true">
+                <BoardIcon icon={b.icon} name={b.name} size={15} />
               </span>
               <span className="min-w-0 flex-1 flex items-center justify-between gap-2">
                 <span className="j13-bcard-name truncate">{b.name}</span>
@@ -126,6 +127,7 @@ export function WorkspaceNavMobile({
             className="j13-chip"
             aria-current={activeBoard === b.id ? "page" : undefined}
           >
+            <BoardIcon icon={b.icon} name={b.name} size={13} />
             {b.name}
           </Link>
         ))}