fix(projects+assets): 项目封面引用真实商品图 + 资产库排除软删资产

- 项目卡封面:废弃「项目名关键词→静态 mock 假图」映射(与真实数据脱节,导致全是假面膜图),
  改用后端 cover_preview_url(取商品 cover_asset 主图);无商品图 → 干净占位
- 资产库 queryset/summary/facets 补 is_deleted=False:软删资产不再出现在资产库与 tab 计数
  (此前 is_deleted 字段在资产库未生效,软删无效)
- 单测 AssetSoftDeleteTests:列表 + 计数均排除软删

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

core/frontend/src/routes/projects.tsx

@@ -396,20 +396,9 @@ function projShotMeta(project: Project): string {
   const dur = projDurationLabel(project);
   return dur ? `${shots} 镜 · ${dur}` : `${shots} 镜`;
 }
-// 复刻 mock-media coverFor:按项目名关键词映射封面图(无匹配 → 占位)
-function projCover(name: string): string {
-  const t = name.replace(/\s+/g, "");
-  if (/蓝牙|耳机|南卡/.test(t)) return "cover-earbuds.png";
-  if (/速食|牛肉面|泡面|面条/.test(t)) return "cover-noodle.png";
-  if (/防晒/.test(t)) return "cover-sunscreen.png";
-  if (/咖啡|冻干/.test(t)) return "cover-coffee.png";
-  if (/空气炸锅|小熊/.test(t)) return "cover-air-fryer.png";
-  if (/瑜伽裤|露露/.test(t)) return "cover-yoga.png";
-  if (/v1|final|已完成|成片|敷面膜|化妆台/.test(t)) return "cover-mask-final.png";
-  if (/面膜|补水|玻尿酸|透真/.test(t)) return "cover-mask-v3.png";
-  return "";
-}
-const projMock = (file: string): CSSProperties => ({ ["--mock-media-url"]: `url(/exact/assets/mock/${file})` } as CSSProperties);
+// 项目卡封面 = 该项目商品的主图(后端 cover_preview_url,取商品 cover_asset)。无图 → 占位。
+// (原先按项目名关键词映射静态 mock 假图,与真实数据脱节,已废弃。)
+const coverStyle = (url: string): CSSProperties => ({ ["--mock-media-url"]: `url(${url})` } as CSSProperties);
 
 const PROJ_TABS: Array<{ filter: "all" | "wip" | "done" | "fail"; label: string }> = [
   { filter: "all", label: "全部" }, { filter: "wip", label: "进行中" }, { filter: "done", label: "已完成" }, { filter: "fail", label: "失败" }
@@ -638,7 +627,7 @@ export function ProjectsPage({ products, projects, loading = false, navigate, op
             <tbody id="list-tbody">
               {pageItems.map((project) => {
                 const no = projStageNo(project);
-                const cover = projCover(project.name);
+                const cover = project.cover_preview_url || "";
                 const isSel = selected.has(project.id);
                 return (
                   <tr key={project.id} data-status={projBucket(project)} data-name={project.name} className={editMode && isSel ? "row-selected" : undefined} onClick={() => (editMode ? toggleSelect(project.id) : openPipeline(project.id))}>
@@ -647,7 +636,7 @@ export function ProjectsPage({ products, projects, loading = false, navigate, op
                         {editMode && (
                           <span className={`row-check${isSel ? " on" : ""}`} aria-hidden="true"><svg viewBox="0 0 16 16" fill="none" stroke="currentColor" strokeWidth="2.5" strokeLinecap="round" strokeLinejoin="round"><polyline points="3 8 7 12 13 4" /></svg></span>
                         )}
-                        <div className={`placeholder proj-thumb${cover ? " has-mock-media" : ""}`} style={cover ? projMock(cover) : undefined}><span className="ph-frame">9:16</span></div>
+                        <div className={`placeholder proj-thumb${cover ? " has-mock-media" : ""}`} style={cover ? coverStyle(cover) : undefined}><span className="ph-frame">9:16</span></div>
                         <div><div className="proj-name">{project.name}</div><div className="proj-sub">{projShotMeta(project)}</div></div>
                       </div>
                     </td>
@@ -681,13 +670,13 @@ export function ProjectsPage({ products, projects, loading = false, navigate, op
         </div>
       ) : (
         <div className="proj-grid">{pageItems.map((project) => {
-          const cover = projCover(project.name);
+          const cover = project.cover_preview_url || "";
           const no = projStageNo(project);
           const isSel = selected.has(project.id);
           return (
             <article className={`proj-card${editMode && isSel ? " selected" : ""}`} key={project.id} onClick={() => (editMode ? toggleSelect(project.id) : openPipeline(project.id))}>
               <span className="card-check" aria-hidden="true"><svg viewBox="0 0 16 16" fill="none" stroke="currentColor" strokeWidth="2.5" strokeLinecap="round" strokeLinejoin="round"><polyline points="3 8 7 12 13 4" /></svg></span>
-              <div className={`placeholder card-thumb${cover ? " has-mock-media" : ""}`} style={cover ? projMock(cover) : undefined}><span className="ph-frame">9:16</span></div>
+              <div className={`placeholder card-thumb${cover ? " has-mock-media" : ""}`} style={cover ? coverStyle(cover) : undefined}><span className="ph-frame">9:16</span></div>
               <div className="card-body">
                 <div>
                   <div className="card-name">{project.name}</div>