perf(core): 项目列表改轻量序列化 + 计数走真实 count,根治刷新 2-3s

/api/projects/ 列表此前与详情共用重序列化器(嵌套 阶段/片段/故事板/时间线 + 每资产算 url),
20 个项目把全套关联拉出 → 实测 ~2-3s,正是每次刷新慢的主因。

- 新增 ProjectListSerializer(轻:名/状态/阶段/product/封面/脚本数/镜数);
  ProjectViewSet.get_serializer_class 列表用轻的、详情用全量;
  get_queryset 列表走轻查询(select_related product + annotate 计数,不做那串 12 个重 prefetch)。
  实测 /api/projects/ 2-3s → 0.48s。
- 新增 /api/projects/summary/(total + by_status,只跑 COUNT,不拉项目对象)。
- 计数显示(侧栏徽标 / 仪表盘 总项目·SKU·N 个)改用分页响应的真实 count(productTotal/projectTotal),
  不再用「已加载 20 条」的长度;projects 列表页脚本状态/镜数改读 *_count 字段。

闸:9 页全绿、无瀑布、API 全过;projects 端点提速 ~5x。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

core/frontend/src/routes/dashboard.tsx

@@ -6,13 +6,17 @@ import { money, stageMeta, statusPill } from "./stage-config";
 import { Progress } from "../components/pipeline-stage";
 import { IconKitSvg } from "../components/IconKitSvg";
 
-export function Dashboard({ products, projects, billing, userName, navigate }: {
+export function Dashboard({ products, projects, productTotal, projectTotal, billing, userName, navigate }: {
   products: Product[];
   projects: Project[];
+  productTotal?: number; // 后端真实总数(分页 count),用于「N 个/SKU」展示
+  projectTotal?: number;
   billing: BillingSummary | null;
   userName?: string;
   navigate: (page: Page) => void;
 }) {
+  const projCount = projectTotal ?? projects.length;
+  const prodCount = productTotal ?? products.length;
   // 资产总数:走轻量 summary 接口(各 tab 计数之和),不再吃全局 assets 全量数组
   const [assetCount, setAssetCount] = useState<number | null>(null);
   useEffect(() => {
@@ -43,8 +47,8 @@ export function Dashboard({ products, projects, billing, userName, navigate }: {
           </button>
         </div>
       </div>
-      <div className="stats with-corners"><span className="corner-tr">+</span><span className="corner-bl">+</span><KpiStat label="总项目" badge="ALL" value={projects.length} delta={`↑ 本月 +${Math.max(projects.length, 0)}`} /><KpiStat label="进行中" badge="WIP" value={running} delta="待处理" /><KpiStat label="成片" badge="DONE" value={completed} delta="导出完成" /><button className="stat" type="button" onClick={() => navigate("account")}><div className="lbl">余额 <span className="badge">¥</span></div><div className="v">{money(billing?.account.balance)}</div><div className="bar"><span style={{ width: "38%" }} /></div><div className="sub">已冻结 {money(billing?.account.reserved_balance)}</div></button></div>
-      <div className="dash-grid"><div><div className="section-h"><h2>最近项目</h2><button className="more" type="button" onClick={() => navigate("projects")}>[ ALL · {projects.length} ] →</button></div><div className="card-hard">{projects.slice(0, 6).map((project) => <button className="recent-row" key={project.id} type="button" onClick={() => navigate("pipeline")}><div className="placeholder thumb"><span className="ph-frame">9:16</span></div><div className="recent-meta"><div className="name">{project.name}</div><div className="sub">{productTitle(project.product)} / AI 全生 / 4 镜</div></div><Progress status={project.current_stage} /><span className={`pill ${statusPill(project.status)}`}><span className="dot" />{stageMeta[project.current_stage]?.label || project.current_stage}</span><span className="btn btn-sm">继续</span></button>)}</div></div><div style={{ display: "flex", flexDirection: "column", gap: 24 }}><div><div className="section-h"><h2>快捷入口</h2><span className="more">[ /shortcuts ]</span></div><div className="shortcuts"><Shortcut name="package" title="商品库" desc={`${products.length} SKU`} onClick={() => navigate("products")} /><Shortcut name="images" title="资产库" desc={`${assetCount ?? "…"} 资产`} onClick={() => navigate("library")} /><Shortcut name="creditCard" title="充值" desc={money(billing?.account.balance)} onClick={() => navigate("account")} /><Shortcut name="clapperboard" title="所有项目" desc={`${projects.length} 个`} onClick={() => navigate("projects")} /></div></div><div><div className="section-h"><h2>提示</h2><span className="more">[ FAQ ]</span></div><div className="tip"><strong>扣费规则</strong>生成失败、超时、用户重跑 — 均不扣费。仅在你点 <span className="mono">[ 确认通过 ]</span> 时按 token 实际结算。</div></div></div></div>
+      <div className="stats with-corners"><span className="corner-tr">+</span><span className="corner-bl">+</span><KpiStat label="总项目" badge="ALL" value={projCount} delta={`↑ 本月 +${Math.max(projCount, 0)}`} /><KpiStat label="进行中" badge="WIP" value={running} delta="待处理" /><KpiStat label="成片" badge="DONE" value={completed} delta="导出完成" /><button className="stat" type="button" onClick={() => navigate("account")}><div className="lbl">余额 <span className="badge">¥</span></div><div className="v">{money(billing?.account.balance)}</div><div className="bar"><span style={{ width: "38%" }} /></div><div className="sub">已冻结 {money(billing?.account.reserved_balance)}</div></button></div>
+      <div className="dash-grid"><div><div className="section-h"><h2>最近项目</h2><button className="more" type="button" onClick={() => navigate("projects")}>[ ALL · {projCount} ] →</button></div><div className="card-hard">{projects.slice(0, 6).map((project) => <button className="recent-row" key={project.id} type="button" onClick={() => navigate("pipeline")}><div className="placeholder thumb"><span className="ph-frame">9:16</span></div><div className="recent-meta"><div className="name">{project.name}</div><div className="sub">{productTitle(project.product)} / AI 全生 / 4 镜</div></div><Progress status={project.current_stage} /><span className={`pill ${statusPill(project.status)}`}><span className="dot" />{stageMeta[project.current_stage]?.label || project.current_stage}</span><span className="btn btn-sm">继续</span></button>)}</div></div><div style={{ display: "flex", flexDirection: "column", gap: 24 }}><div><div className="section-h"><h2>快捷入口</h2><span className="more">[ /shortcuts ]</span></div><div className="shortcuts"><Shortcut name="package" title="商品库" desc={`${prodCount} SKU`} onClick={() => navigate("products")} /><Shortcut name="images" title="资产库" desc={`${assetCount ?? "…"} 资产`} onClick={() => navigate("library")} /><Shortcut name="creditCard" title="充值" desc={money(billing?.account.balance)} onClick={() => navigate("account")} /><Shortcut name="clapperboard" title="所有项目" desc={`${projCount} 个`} onClick={() => navigate("projects")} /></div></div><div><div className="section-h"><h2>提示</h2><span className="more">[ FAQ ]</span></div><div className="tip"><strong>扣费规则</strong>生成失败、超时、用户重跑 — 均不扣费。仅在你点 <span className="mono">[ 确认通过 ]</span> 时按 token 实际结算。</div></div></div></div>
     </>
   );
 }