refactor(网页发布): 首次发布与更新共用统一发布组装

- handleSubmit 与 handleUpdateSubmit 原先逐字复制 压包→媒体→metadata→parts→submitGamePublish
- 抽成组件内 runUnifiedPublish(target, versionNumber, priceMudPoints)，成功收尾仍各模式自理
- 新增字段或校验变化不再需要改两处

src/components/game-distribution/GamePublishPage.tsx

@@ -48,7 +48,11 @@ import {
   resolveGamePublishPriceMudPoints,
   resolvePublishMetadataError,
 } from './gamePublishMetadata';
-import { createGamePublishSubmission } from './gamePublishSubmission';
+import {
+  createGamePublishSubmission,
+  type GamePublishSubmissionSuccess,
+  type GamePublishSubmissionTarget,
+} from './gamePublishSubmission';
 import { prepareGamePackage } from './gameZipPackage';
 
 type GamePublishPageProps = {
@@ -418,6 +422,42 @@ export function GamePublishPage({
     }
   }
 
+  /**
+   * 统一发布接口的一次完整组装：压包 → 读媒体 → 组 metadata/parts → 提交。
+   *
+   * 首次发布与更新模式只差 `target` 与冻结版本号；编排必须共用一处，否则新增字段或校验变化时
+   * 两条链路会各自漂移。成功后的收尾由调用方按模式各自处理。
+   */
+  async function runUnifiedPublish(input: {
+    target: GamePublishSubmissionTarget;
+    versionNumber: number;
+    priceMudPoints: number;
+  }): Promise<GamePublishSubmissionSuccess> {
+    const prepared = await prepareGamePackage(packageFile as File);
+    const submission = buildGamePublishMediaSubmission(
+      coverImage,
+      screenshotImages,
+    );
+    const gameMetadata = buildPublishGameMetadata(submission);
+    const media = buildPublishMediaParts(submission);
+    return submitGamePublish({
+      ownerUserId: currentUserId,
+      title,
+      target: input.target,
+      versionNumber: input.versionNumber,
+      packageSha256: prepared.sha256,
+      packageBytes: prepared.totalBytes,
+      packageFileCount: prepared.fileCount,
+      packageEntryPath: 'index.html',
+      priceMudPoints: input.priceMudPoints,
+      gameMetadata,
+      packageBody: new Blob([prepared.bytes as unknown as BlobPart], {
+        type: 'application/zip',
+      }),
+      media,
+    });
+  }
+
   /**
    * 更新模式：走统一发布接口在既有 `gameId` 下创建不可变新版本并送审；
    * 公开版本只在管理员通过后切换，期间旧版本继续在线。
@@ -453,29 +493,11 @@ export function GamePublishPage({
     setIsSubmitting(true);
     setError('');
     try {
-      const prepared = await prepareGamePackage(packageFile);
-      const submission = buildGamePublishMediaSubmission(
-        coverImage,
-        screenshotImages,
-      );
-      const gameMetadata = buildPublishGameMetadata(submission);
-      const media = buildPublishMediaParts(submission);
       // 统一发布接口只用 gameId + 冻结版本号做身份，不再读后端版本上限。
-      const result = await submitGamePublish({
-        ownerUserId: currentUserId,
-        title,
+      const result = await runUnifiedPublish({
         target: { mode: 'update', gameId: updateContext.gameId },
         versionNumber: updateContext.versionNumber + 1,
-        packageSha256: prepared.sha256,
-        packageBytes: prepared.totalBytes,
-        packageFileCount: prepared.fileCount,
-        packageEntryPath: 'index.html',
         priceMudPoints: price.priceMudPoints,
-        gameMetadata,
-        packageBody: new Blob([prepared.bytes as unknown as BlobPart], {
-          type: 'application/zip',
-        }),
-        media,
       });
       setPublishedGameId(updateContext.gameId);
       setUpdateContext((current) =>
@@ -528,30 +550,12 @@ export function GamePublishPage({
     setIsSubmitting(true);
     setError('');
     try {
-      const prepared = await prepareGamePackage(packageFile);
-      const submission = buildGamePublishMediaSubmission(
-        coverImage,
-        screenshotImages,
-      );
-      const gameMetadata = buildPublishGameMetadata(submission);
-      const media = buildPublishMediaParts(submission);
       // 首次发布只调一次统一接口：草稿里的 projectKey + versionNumber 是自然幂等键，
       // 响应丢失后重试会命中同一个游戏与版本，而不是新建第二份。
-      const result = await submitGamePublish({
-        ownerUserId: currentUserId,
-        title,
+      const result = await runUnifiedPublish({
         target: { mode: 'create' },
         versionNumber: 1,
-        packageSha256: prepared.sha256,
-        packageBytes: prepared.totalBytes,
-        packageFileCount: prepared.fileCount,
-        packageEntryPath: 'index.html',
         priceMudPoints: price.priceMudPoints,
-        gameMetadata,
-        packageBody: new Blob([prepared.bytes as unknown as BlobPart], {
-          type: 'application/zip',
-        }),
-        media,
       });
       setPublishedGameId(result.gameId);
     } catch (submitError: unknown) {