feat(svcitem): 事项库+办事大厅 R2 前端三页，并复用富文本组件消除双份实现

落地（依据《事项库与办事大厅详细设计 v1》§7）
- 路由：办事事项 modId=21 / 服务字典 modId=22 + 子站镜像（/sch/{code}/site/{siteCode}/svc/*）
  + 3 条 legacyRedirect 旧链兼容；SchoolLayout 菜单图标兜底
- ServiceItemList：三维筛选/关键字/分页/发布下架删除/跳转编辑
- ServiceItemEdit：三段富文本 + 封面 + 指南附件上传回显（attList）+「我要办理外链」提示
  + 部门选择器不可达时提示"可留空保存"
- ServiceDictManage：object/category 双 Tab，被引用键编辑锁定 + 删除引用守护提示
- api/类型：SvcItemApi/SvcDictApi 与 types/cms.ts 契约补齐；站点设置补 svc_hall_base 键

审计修复（docs/18）
- D3 接线：列表页新增 ServiceItemSortModal 拖拽排序（顺序源 selList，保存按下标重排 sort_no）
  与「同步部门名」按钮，此前后端 sort/syncDeptName 已备但前端无入口
- 附件场景拆分：封面与三个富文本编辑器改传 scene=svc_item_asset，指南附件保持 svc_item
  （内容资产由后端按内容派生归属，不再依赖前端收集上传 id——删除只写不读的 uploadedIds 记账）
- 部门组树：SvcDeptVo 增 children，前端 flattenDepts 缩进扁平化（后端改嵌套下发，交互不变）
- RichTextEditor 补 articleId/slateMinHeight prop 并去掉死状态 editorLoading；
  ArticleEdit 改为复用该组件（正文区最小高度按原口径传入，观感不变），消除双份 wangEditor 实现

测试与 mock
- mock 补 /api/svc/** 全量桩（事项分页/字典/部门树/排序/同步部门名/附件回显 + 站点 1、2 示例数据），
  dev:mock 下三页可用（实测 curl 各项响应正确）
- cms.spec 补 save/syncDeptName/selList/dict save+delete 契约；siteRouter.spec 补事项三条路由
  modId 与子站镜像 resolve 断言；新增 RichTextEditor.spec 5 例（上传参数三键/成功 emit/失败不 emit/工具栏排除项）
- vitest 127 用例全绿 + vite build 通过

mock/index.ts

@@ -12,7 +12,7 @@
 import type { Plugin } from "vite";
 import type { IncomingMessage, ServerResponse } from "http";
 import { MockDb, categoryTree, categoryName, nextId, seedDb } from "./data";
-import { MockAttachment, MockBanner, MockLink, MockSite } from "./data";
+import { MockAttachment, MockBanner, MockLink, MockSite, MockSvcDict, MockSvcItem } from "./data";
 
 const db: MockDb = seedDb();
 
@@ -855,6 +855,186 @@ async function handleApi(req: IncomingMessage, res: ServerResponse, path: string
         return true;
     }
 
+    /* ---- 事项库：服务字典 + 服务部门 ---- */
+    if (method === "GET" && path === "/api/svc/dict/list") {
+        const siteId = num(q(req, "siteId"), 0)!;
+        const dictType = q(req, "dictType");
+        const rows = db.svcDicts
+            .filter(d => d.siteId === siteId && (!dictType || d.dictType === dictType))
+            .sort((x, y) => x.sortNo - y.sortNo || x.id - y.id)
+            .map(d => ({
+                ...d,
+                referenced: db.svcItems.filter(i =>
+                    d.dictType === "category" ? i.categoryKey === d.dictKey : i.objectKey === d.dictKey
+                ).length,
+            }));
+        sendJson(res, ok(rows));
+        return true;
+    }
+    if (method === "POST" && path === "/api/svc/dict/save") {
+        const body = await readJson<Partial<MockSvcDict>>(req);
+        if (body.id) {
+            const i = db.svcDicts.findIndex(d => d.id === body.id);
+            if (i >= 0) db.svcDicts[i] = { ...db.svcDicts[i], ...body } as MockSvcDict;
+            sendJson(res, ok(db.svcDicts[i]?.id ?? null));
+        } else {
+            const row: MockSvcDict = {
+                id: nextId(db.svcDicts),
+                siteId: body.siteId!,
+                dictType: body.dictType || "object",
+                dictKey: body.dictKey || "",
+                dictName: body.dictName || "",
+                sortNo: body.sortNo ?? 0,
+                status: body.status ?? 1,
+            };
+            db.svcDicts.push(row);
+            sendJson(res, ok(row.id));
+        }
+        return true;
+    }
+    if (method === "POST" && path === "/api/svc/dict/delete") {
+        const { id } = await readJson<{ id: number }>(req);
+        db.svcDicts = db.svcDicts.filter(d => d.id !== id);
+        sendJson(res, ok(null));
+        return true;
+    }
+    if (method === "GET" && path === "/api/svc/dept/tree") {
+        // 模拟 UserBase 组树经 type 过滤后嵌套下发：学校 → 校内处室
+        sendJson(res, ok([
+            {
+                id: 100,
+                name: "云海大学",
+                children: [
+                    { id: 10, name: "教务处", children: [] },
+                    { id: 20, name: "后勤处", children: [] },
+                    { id: 30, name: "学生工作处", children: [] },
+                ],
+            },
+        ]));
+        return true;
+    }
+
+    /* ---- 事项库：办事事项管理 ---- */
+    if (method === "GET" && path === "/api/svc/item/page") {
+        const siteId = num(q(req, "siteId"), 0)!;
+        const status = q(req, "status");
+        const objectKey = q(req, "objectKey");
+        const categoryKey = q(req, "categoryKey");
+        const keyword = q(req, "keyword");
+        const page = num(q(req, "page"), 1)!;
+        const pageSize = num(q(req, "pageSize"), 10)!;
+        const dictName = (type: "object" | "category", key?: string) =>
+            key ? db.svcDicts.find(d => d.siteId === siteId && d.dictType === type && d.dictKey === key)?.dictName : undefined;
+        const filtered = db.svcItems
+            .filter(i => i.siteId === siteId)
+            .filter(i => (status === undefined || status === null || status === "" ? true : i.status === Number(status)))
+            .filter(i => (!objectKey ? true : i.objectKey === objectKey))
+            .filter(i => (!categoryKey ? true : i.categoryKey === categoryKey))
+            .filter(i => (!keyword ? true : i.title.includes(keyword) || i.itemCode.includes(keyword)))
+            .sort((x, y) => x.sortNo - y.sortNo || y.id - x.id);
+        const start = (page - 1) * pageSize;
+        sendJson(res, ok({
+            total: filtered.length,
+            list: filtered.slice(start, start + pageSize).map(i => ({
+                ...i,
+                objectName: dictName("object", i.objectKey),
+                categoryName: dictName("category", i.categoryKey),
+                applyUrl: i.extJson ? (JSON.parse(i.extJson).apply_url as string) : undefined,
+            })),
+        }));
+        return true;
+    }
+    if (method === "GET" && path === "/api/svc/item/get") {
+        const id = num(q(req, "id"), 0)!;
+        const item = db.svcItems.find(i => i.id === id);
+        if (!item) {
+            sendJson(res, { code: 2, msg: "事项不存在", data: null });
+            return true;
+        }
+        sendJson(res, ok({
+            ...item,
+            applyUrl: item.extJson ? (JSON.parse(item.extJson).apply_url as string) : undefined,
+        }));
+        return true;
+    }
+    if (method === "POST" && path === "/api/svc/item/save") {
+        const body = await readJson<Partial<MockSvcItem> & { applyUrl?: string }>(req);
+        const extJson = body.applyUrl ? JSON.stringify({ apply_url: body.applyUrl }) : undefined;
+        if (body.id) {
+            const i = db.svcItems.findIndex(x => x.id === body.id);
+            if (i >= 0) db.svcItems[i] = { ...db.svcItems[i], ...body, extJson } as MockSvcItem;
+            sendJson(res, ok(db.svcItems[i]?.id ?? null));
+        } else {
+            const row: MockSvcItem = {
+                id: nextId(db.svcItems),
+                siteId: body.siteId!,
+                itemCode: body.itemCode || "",
+                title: body.title || "",
+                handleMode: body.handleMode ?? 1,
+                onlineFlag: body.onlineFlag ?? 1,
+                sortNo: body.sortNo ?? 0,
+                status: 0,
+                viewCount: 0,
+                createTime: daysAgo(0),
+                ...body,
+                extJson,
+            } as MockSvcItem;
+            db.svcItems.push(row);
+            sendJson(res, ok(row.id));
+        }
+        return true;
+    }
+    const svcStateMatch = path.match(/^\/api\/svc\/item\/(publish|offline)\/(\d+)$/);
+    if (method === "POST" && svcStateMatch) {
+        const item = db.svcItems.find(i => i.id === Number(svcStateMatch[2]));
+        if (item) {
+            item.status = svcStateMatch[1] === "publish" ? 1 : 2;
+            if (item.status === 1) item.publishTime = daysAgo(0);
+            else item.offlineTime = daysAgo(0);
+        }
+        sendJson(res, ok(null));
+        return true;
+    }
+    if (method === "POST" && path === "/api/svc/item/delete") {
+        const { id } = await readJson<{ id: number }>(req);
+        db.svcItems = db.svcItems.filter(i => i.id !== id);
+        sendJson(res, ok(null));
+        return true;
+    }
+    if (method === "POST" && path === "/api/svc/item/sort") {
+        const pairs = await readJson<{ id: number; sortNo: number }[]>(req);
+        (pairs || []).forEach(p => {
+            const item = db.svcItems.find(i => i.id === p.id);
+            if (item) item.sortNo = p.sortNo;
+        });
+        sendJson(res, ok(null));
+        return true;
+    }
+    if (method === "POST" && path === "/api/svc/item/syncDeptName") {
+        sendJson(res, ok({ updated: 0 }));
+        return true;
+    }
+    if (method === "GET" && path === "/api/svc/item/selList") {
+        const siteId = num(q(req, "siteId"), 0)!;
+        const rows = db.svcItems
+            .filter(i => i.siteId === siteId)
+            .sort((x, y) => x.sortNo - y.sortNo || x.id - y.id)
+            .map(i => ({ id: i.id, itemCode: i.itemCode, title: i.title, status: i.status }));
+        sendJson(res, ok(rows));
+        return true;
+    }
+    if (method === "GET" && path === "/api/svc/item/attList") {
+        const siteId = num(q(req, "siteId"), 0)!;
+        const id = num(q(req, "id"), 0)!;
+        const ids = db.svcItems.find(i => i.id === id)?.attachmentIds || [];
+        sendJson(res, ok(
+            db.attachments
+                .filter(a => a.siteId === siteId && ids.includes(a.id))
+                .map(a => ({ id: a.id, fileName: a.fileName, webUrl: a.url, fileSize: a.fileSize }))
+        ));
+        return true;
+    }
+
     return false;
 }