feat(growth): same-day 1-day baselines for new videos

Let 1-day view growth use a zero baseline for videos published today, and the first successful sample for older videos ingested today, without mixing those into 7/30-day rankings.

reaction_board/web/static/views/video.js

@@ -62,7 +62,7 @@ export async function renderVideo(root, { params, query }) {
           <span>${escapeHtml(formatDuration(detail.duration))}</span>
           ${detail.pages ? `<span>${formatNumber(detail.pages)} P</span>` : ""}
           ${badge(statusLabel(detail.status), `status-${detail.status}`)}
-          ${samples < 2 ? badge("样本不足", "warning") : ""}
+          ${samples < 2 && !detail.growth?.available ? badge("样本不足", "warning") : ""}
         </div>
         ${detail.blacklisted ? `<p class="section-note warning-text">该 UP 在黑名单中；黑名单只影响未来发现，不影响当前视频追踪。</p>` : ""}
         ${detail.up_follower_backfilled ? `<p class="section-note">UP 粉丝数为回填值，不是真实的入库时点。</p>` : ""}