feat(cms): docs/16 站点设置整页化+首页布局编辑器- SiteSetting.vue整页7分区(基本信息/皮肤与外观/首页布局/基础展示/页脚信息/SEO与域名/扩展参数)锚点导航sticky+IntersectionObserver+分区卡片三段式每分区独立保存(configJson单一事实源+submitSection统一提交);创建模式仅①②可编辑其余锁定,创建成功原地replace到site/setting/:id;SiteWizard三步向导退役删除(门户预览收编portalPreviewUrl);SiteManage瘦身表格+行内编辑跳整页(adminPathOf子站带站点段);ImageAssetField图片双通道(上传+路径粘贴折叠);SiteConfigForm支持groups/showExtras/siteId+asset字段接ImageAssetField+三旧键表单不再展示(ABSORBED_LEGACY_KEYS静默保留);homeLayout三件套(homeLayout.ts模型parse/serialize/validate/genFromCategories一键生成+blockTypes.ts注册表showIf条件字段+HomeLayoutEditor.vue序列编辑增删显隐上移下移);routes site/new+site/setting/:id+legacy redirect;CategoryManage home_style提示改口指向首页布局;新增siteSetting.spec+homeLayout.spec,重写siteManage.spec,117用例全绿

src/utils/siteConfigForm.spec.ts

@@ -107,10 +107,9 @@ describe("siteConfigForm", () => {
         expect(firstExtraError([])).toBe("");
     });
 
-    it("已知键清单与 docs/09 §0 键盘点表一致（防漂移）", () => {
+    it("已知键清单与 docs/09 §0 键盘点表一致（防漂移；docs/16 D4 吸收三旧键后收敛）", () => {
         expect(SITE_CONFIG_FIELD_DEFS.map(d => d.key)).toEqual([
             "logo", "favicon", "slogan", "colleges_label",
-            "news_bg_image", "gallery_title", "gallery_subtitle",
             "contact", "footer_addresses", "qr_wechat", "qr_weibo",
             "social_wechat", "social_weibo", "social_douyin", "social_bilibili",
             "copyright", "beian",
@@ -118,13 +117,12 @@ describe("siteConfigForm", () => {
             "domain", "public_base_url",
         ]);
     });
-    it("docs/12：页脚增强与首页视觉新键 parse/serialize/校验（qr_* asset、social_* url）", () => {
+    it("docs/12：页脚增强新键 parse/serialize/校验（qr_* asset、social_* url）", () => {
         const json = JSON.stringify({
             footer_addresses: "潭山校区：南湖路 237 号 邮编：464000\n淮河校区：大学路 1 号 邮编：464300",
             qr_wechat: "/cms/upload/qr-wechat.png",
             social_weibo: "https://weibo.com/xxx",
             social_douyin: "not-a-url",
-            gallery_title: "线上展厅",
         });
         const m = parseSiteConfig(json);
         expect(m.fields.footer_addresses).toContain("淮河校区");
@@ -140,7 +138,15 @@ describe("siteConfigForm", () => {
         const out = JSON.parse(serializeSiteConfig(m));
         expect(out.footer_addresses).toContain("邮编：464300");
         expect(out).not.toHaveProperty("social_bilibili");
-        expect(out.gallery_title).toBe("线上展厅");
+    });
+    it("docs/16 D4：gallery_title/gallery_subtitle/news_bg_image 被吸收为静默保留键（不落扩展行、无损回写）", () => {
+        const json = JSON.stringify({ gallery_title: "线上展厅", news_bg_image: "/cms/upload/campus.jpg" });
+        const m = parseSiteConfig(json);
+        expect(m.fields).toEqual({}); // 不进任何分区表单
+        expect(m.extras).toEqual([]); // 也不落扩展行
+        expect(m.preserved.gallery_title).toBe("线上展厅");
+        expect(m.preserved.news_bg_image).toBe("/cms/upload/campus.jpg");
+        expect(JSON.parse(serializeSiteConfig(m))).toEqual(JSON.parse(json)); // 存量值无损保留
     });
     it("B3：custom_css 为保留键，不入扩展行，parse/serialize 无损往返", () => {
         const json = JSON.stringify({ custom_css: ".site-header{padding:16px 0}", my_ext: "v" });

src/utils/siteConfigForm.ts

@@ -39,21 +39,6 @@ export const SITE_CONFIG_FIELD_DEFS: SiteConfigFieldDef[] = [
         placeholder: "留空默认「专业院系」",
         tip: "门户右上「专业院系」下拉的文案；仅主站有效（下拉由院系子站生成）。",
     },
-    {
-        key: "news_bg_image", label: "新闻卡背景图", group: "display", kind: "asset", maxLength: 500,
-        placeholder: "如 /yschcms/upload/…/campus.jpg（留空用主题渐变）",
-        tip: "首页「双栏新闻卡」板块的全幅背景大图（建议 1920×700）；仅展示型皮肤（campus-glow）消费。",
-    },
-    {
-        key: "gallery_title", label: "展厅标题", group: "display", kind: "text", maxLength: 50,
-        placeholder: "留空默认「线上展厅」",
-        tip: "首页图片画廊文区头主标题。",
-    },
-    {
-        key: "gallery_subtitle", label: "展厅英文副题", group: "display", kind: "text", maxLength: 100,
-        placeholder: "留空默认 Online Exhibition Hall",
-        tip: "首页图片画廊文区头英文副题。",
-    },
     {
         key: "contact", label: "联系方式", group: "footer", kind: "text", maxLength: 200, multiline: true,
         placeholder: "如：电话 0571-88888888 · 地址杭州市 XX 路 100 号",
@@ -119,9 +104,18 @@ export const SITE_CONFIG_GROUPS: { name: SiteConfigGroup; title: string }[] = [
     { name: "domain", title: "域名与访问" },
 ];
 
-/** 系统托管键：不进表单，解析时原样保留、序列化时无损回写（theme_params 由主题参数表单维护） */
+/**
+ * 系统托管键：不进表单，解析时原样保留、序列化时无损回写（theme_params 由主题参数表单维护；
+ * custom_css 由站点设置「皮肤与外观」分区维护）。
+ */
 export const RESERVED_SITE_CONFIG_KEYS = ["theme_params", "custom_css"];
 
+/**
+ * docs/16 D4 被吸收的旧键：画廊标题/副题、新闻卡背景图改由首页布局区块属性承载（home_layout），
+ * 分区表单不再展示；存量值静默保留（渲染端仍作区块未设 title/background 时的默认值）。
+ */
+export const ABSORBED_LEGACY_KEYS = ["gallery_title", "gallery_subtitle", "news_bg_image"];
+
 /** 扩展键名约束（与后端 CONFIG_KEY_PATTERN 一致） */
 export const EXTRA_KEY_RE = /^[A-Za-z_][A-Za-z0-9_]*$/;
 
@@ -160,7 +154,7 @@ export function parseSiteConfig(configJson: string | undefined | null): SiteConf
         return model;
     }
     const known = new Set(SITE_CONFIG_FIELD_DEFS.map(f => f.key));
-    const reserved = new Set(RESERVED_SITE_CONFIG_KEYS);
+    const reserved = new Set([...RESERVED_SITE_CONFIG_KEYS, ...ABSORBED_LEGACY_KEYS]);
     Object.keys(parsed).forEach(k => {
         const v = parsed![k];
         if (typeof v !== "string") {