同步主站 Cocos 当前工程：关卡资源、运行脚本与打包工具。

Co-authored-by: Cursor <cursoragent@cursor.com>

assets/scripts/level/LevelDatabase.ts

@@ -112,10 +112,19 @@ function shardKey(shard: { file: string }) {
     return shard.file;
 }
 
+function practiceLevelCount(ids: number[]): number {
+    let n = 0;
+    for (const id of ids) {
+        if (id >= LEVEL_ID_BASE) n += 1;
+    }
+    return n;
+}
+
 function validateIndex(index: LevelsDbIndex): void {
-    if (index.total < 1 || index.min < LEVEL_ID_BASE) {
+    // 允许备用 1–400 + 练习 91601+；不能只看 min（备用关会把 min 拉到 1）
+    if (index.total < 100 || index.max < LEVEL_ID_BASE) {
         throw new Error(
-            `关卡库索引无效 (${index.total} 关)，请重新 package-for-project`,
+            `关卡库索引过旧 (${index.total} 关)，请重新 package-for-project`,
         );
     }
 }
@@ -132,10 +141,10 @@ function validateIngested(): void {
         return;
     }
     const total = sortedIds.length;
-    const minId = sortedIds[0] ?? 0;
-    if (total < 1 || minId < LEVEL_ID_BASE) {
+    const practice = practiceLevelCount(sortedIds);
+    if (total < 100 || practice < 100) {
         throw new Error(
-            `关卡库无效 (${total} 关)，请用主站导出的 levels-database.json；`
+            `关卡库过旧 (${total} 关)，请用主站导出的 levels-database.json；`
             + '运行 bash tools/sync-level-db.sh 后重新 package-for-project',
         );
     }
@@ -175,22 +184,38 @@ function indexFetchCandidates(): string[] {
     return [...new Set(out)];
 }
 
+function looksLikeJsonText(text: string): boolean {
+    const t = text.replace(/^\uFEFF/, '').trimStart();
+    return t.startsWith('{') || t.startsWith('[');
+}
+
+async function decodePossiblyBrotliJson(ab: ArrayBuffer, expectBrotli: boolean): Promise<unknown> {
+    const raw = new TextDecoder().decode(ab);
+    if (!expectBrotli || looksLikeJsonText(raw)) {
+        return JSON.parse(raw);
+    }
+    if (typeof DecompressionStream === 'undefined') {
+        throw new Error('浏览器不支持 Brotli 解压');
+    }
+    const text = await new Response(ab)
+        .pipeThrough(new DecompressionStream('brotli'))
+        .text();
+    return JSON.parse(text);
+}
+
 async function fetchJsonWithBrotli(url: string): Promise<unknown> {
     const brUrl = url.replace(/\.json(\?.*)?$/i, '.json.br$1');
     try {
-        const brRes = await fetch(brUrl);
-        if (brRes.ok && typeof DecompressionStream !== 'undefined') {
-            const text = await new Response(await brRes.arrayBuffer())
-                .pipeThrough(new DecompressionStream('brotli'))
-                .text();
-            return JSON.parse(text);
+        const brRes = await fetch(brUrl, { credentials: 'same-origin' });
+        if (brRes.ok) {
+            return decodePossiblyBrotliJson(await brRes.arrayBuffer(), true);
         }
     } catch {
         /* fallback */
     }
     const res = await fetch(url, { credentials: 'same-origin' });
     if (!res.ok) throw new Error(`HTTP ${res.status} for ${url}`);
-    return res.json();
+    return decodePossiblyBrotliJson(await res.arrayBuffer(), false);
 }
 
 async function loadIndexFromNetwork(): Promise<void> {