恢复游戏分发完整实现（特性分支）

- 主站：游戏广场、详情、在线游玩、网页发布与作者中心，以及共享契约与客户端服务
- 后端：module-game-distribution 领域层、SpacetimeDB 表/迁移/绑定、spacetime-client facade、api-server 路由与发行网关
- 后台：游戏审核页（待审列表、通过/拒绝、安全下架）
- AGC：发布面板、本地导出包读取命令与发布服务，含默认跳过的真实链路测试
- 运维：发行来源 nginx 模板与门禁、game-distribution:publish 灰度发布开关、OSS PutObject 受控重试
- 文档：主规范、里程碑与实施计划、决策日志与踩坑记录

src/components/platform-entry/PlatformEntryActiveFlowShell.tsx

@@ -402,6 +402,14 @@ export function PlatformEntryFlowShellImpl({
     setSelectionStage('game-publish', { path: '/games/publish' });
   }, [setSelectionStage]);
 
+  const openGamePublishVersion = useCallback(
+    (gameId: string) => {
+      const path = `/games/publish?game=${encodeURIComponent(gameId)}`;
+      setSelectionStage('game-publish', { path });
+    },
+    [setSelectionStage],
+  );
+
   const openMyGames = useCallback(() => {
     setSelectionStage('game-mine', { path: '/games/mine' });
   }, [setSelectionStage]);
@@ -505,9 +513,11 @@ export function PlatformEntryFlowShellImpl({
     selectionStage === 'game-play' ||
     selectionStage === 'game-mine' ||
     selectionStage === 'game-publish';
-  const gameId = new URLSearchParams(
+  const gameSearchParams = new URLSearchParams(
     typeof window === 'undefined' ? '' : window.location.search,
-  ).get('id');
+  );
+  const gameId = gameSearchParams.get('id');
+  const publishGameId = gameSearchParams.get('game');
   const avatarUrl = authUi?.user?.avatarUrl?.trim() || null;
   const avatarLabel = resolveActiveUserAvatarLabel(authUi?.user);
   const publicUserCode = resolveActivePublicUserCode(authUi?.user);
@@ -727,11 +737,13 @@ export function PlatformEntryFlowShellImpl({
                       <GamePublishPage
                         onBack={openGames}
                         onOpenMyGames={openMyGames}
+                        updateGameId={publishGameId}
                       />
                     ) : selectionStage === 'game-mine' ? (
                       <MyGamesPage
                         onBack={openGames}
                         onOpenDetail={openGameDetail}
+                        onPublishVersion={openGamePublishVersion}
                       />
                     ) : selectionStage === 'game-detail' ? (
                       <GameDetailPage