feat(projects): 新建视频项目去掉「0-10秒·快速种草」时长档

视频时长选项保留其余三档(精准短片 0-15 / 卖点展开 0-30 / 故事化 0-60),
网格由 4 列改回 3 列铺满;默认选中仍为 0-15,下游脚本生成不受影响。

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

core/frontend/src/routes/projects.tsx

@@ -14,7 +14,6 @@ const PROJ_PAGE_SIZE = 10; // 项目列表/网格每页条数
 // 时长 / 脚本风格 / 人设 — 与 projects-new.html 基线对齐(创建页仅作视觉选择,
 // 脚本走向细节进入 Stage 1;onCreate 契约只携带 name + product)。
 const WIZ_DURATIONS = [
-  { id: "0-10", label: "0-10 秒", shots: [3, 4], tag: "快速种草", note: "适合快速种草" },
   { id: "0-15", label: "0-15 秒", shots: [4, 5], tag: "精准短片", note: "适合短平快投放" },
   { id: "0-30", label: "0-30 秒", shots: [6, 8], tag: "卖点展开", note: "适合卖点展开" },
   { id: "0-60", label: "0-60 秒", shots: [10, 12], tag: "故事化", note: "适合故事化表达" }
@@ -309,7 +308,7 @@ export function ProjectWizardPage({ products, projects = [], preselectProductId,
 
               <div className="field">
                 <label className="field-label">视频时长<span className="req">*</span></label>
-                <div className="opt-row cols-4">
+                <div className="opt-row">
                   {WIZ_DURATIONS.map((d) => (
                     <div className={`opt-card${duration === d.id ? " selected" : ""}`} key={d.id} onClick={() => setDuration(d.id)}>
                       <span className="badge">[ {d.tag} ]</span>