chore(scripts): 族谱截图工具支持两节点子树（E2E_CAPTURE_MIN_NODES）

scripts/capture-game-lineage-visual.mjs

@@ -509,6 +509,9 @@ async function captureExistingUrls() {
   const lineageUrl = (process.env.E2E_CAPTURE_LINEAGE_URL ?? '').trim();
   const themeUrl = (process.env.E2E_CAPTURE_THEME_URL ?? '').trim();
   const selectTitle = (process.env.E2E_CAPTURE_SELECT_TITLE ?? '').trim();
+  // 最小节点数：两节点的子树（例如「母版 → 一个衍生」）也要能截，默认 3。
+  const minNodes =
+    Number.parseInt((process.env.E2E_CAPTURE_MIN_NODES ?? '').trim(), 10) || 3;
   // 视口可配：全树总览常常比 960 高，给个高的窗口才能真的「一眼看全」。
   const sizeMatch = /^(\d{3,4})x(\d{3,4})$/u.exec(
     (process.env.E2E_CAPTURE_WINDOW ?? '').trim(),
@@ -555,8 +558,8 @@ async function captureExistingUrls() {
     const page = await desktop.newPage();
     await page.goto(lineageUrl, { waitUntil: 'commit', timeout: 120_000 });
     await page.waitForFunction(
-      () => document.querySelectorAll('.game-lineage-node').length >= 3,
-      undefined,
+      (min) => document.querySelectorAll('.game-lineage-node').length >= min,
+      minNodes,
       { timeout: 120_000 },
     );
     await page.waitForTimeout(1400);
@@ -564,7 +567,7 @@ async function captureExistingUrls() {
     const nodeCount = await page.locator('.game-lineage-node').count();
     check(
       '截图模式：/games/lineage 已渲染多代节点',
-      nodeCount >= 3,
+      nodeCount >= minNodes,
       `nodes=${nodeCount} url=${lineageUrl}`,
     );
     // 首屏视野契约（与 lineage 工具同口径）：要么真的全览，要么按可读缩放下限 + 提示。
@@ -645,8 +648,8 @@ async function captureExistingUrls() {
       timeout: 120_000,
     });
     await mobilePage.waitForFunction(
-      () => document.querySelectorAll('.game-lineage-node').length >= 3,
-      undefined,
+      (min) => document.querySelectorAll('.game-lineage-node').length >= min,
+      minNodes,
       { timeout: 120_000 },
     );
     await mobilePage.waitForTimeout(1400);
@@ -668,7 +671,7 @@ async function captureExistingUrls() {
     }));
     check(
       '截图模式：窄屏下族谱画布可见、节点已渲染且页面不横向溢出',
-      narrow.canvas && narrow.nodes >= 3 && !narrow.overflow,
+      narrow.canvas && narrow.nodes >= minNodes && !narrow.overflow,
       `canvas=${narrow.canvas} nodes=${narrow.nodes} overflow=${narrow.overflow}`,
     );
     await take(mobilePage, '03-lineage-narrow.png');