广场的发布游戏与我的游戏入口上移到 hero 右上角

- GameGalleryPage 新增 .game-page-actions 一行，把「发布游戏」「我的游戏」从 hero 下方的工具栏动作区移出，右对齐放在 hero 上方
- 工具栏只保留「游戏广场」标题与搜索框，不再和入口按钮挤在一行
- .game-page-actions 设 flex-end、0.6rem 间距与 1.1rem 底部间距；两个入口都不可用时整行不渲染，hero 位置不变
- 实测 390/360/820 三档：按钮在 hero 之上、与 hero 间距 18px、右边缘与 hero 对齐
- 里程碑文档记录该布局调整

src/components/game-distribution/GameGalleryPage.tsx

@@ -275,8 +275,33 @@ export function GameGalleryPage({
     [onOpenDetail, scrollKey],
   );
 
+  const hasPageActions = Boolean(onOpenPublish || onOpenMyGames);
+
   return (
     <div className="game-page" ref={attachPageRoot}>
+      {hasPageActions ? (
+        <div className="game-page-actions">
+          {onOpenPublish ? (
+            <PlatformActionButton
+              size="sm"
+              shape="pill"
+              onClick={onOpenPublish}
+            >
+              发布游戏
+            </PlatformActionButton>
+          ) : null}
+          {onOpenMyGames ? (
+            <PlatformActionButton
+              tone="secondary"
+              size="sm"
+              shape="pill"
+              onClick={onOpenMyGames}
+            >
+              我的游戏
+            </PlatformActionButton>
+          ) : null}
+        </div>
+      ) : null}
       <section className="game-hero">
         <div className="game-hero__copy">
           <span className="game-eyebrow">
@@ -313,25 +338,6 @@ export function GameGalleryPage({
           <h2>游戏广场</h2>
         </div>
         <div className="game-toolbar__actions">
-          {onOpenPublish ? (
-            <PlatformActionButton
-              size="sm"
-              shape="pill"
-              onClick={onOpenPublish}
-            >
-              发布游戏
-            </PlatformActionButton>
-          ) : null}
-          {onOpenMyGames ? (
-            <PlatformActionButton
-              tone="secondary"
-              size="sm"
-              shape="pill"
-              onClick={onOpenMyGames}
-            >
-              我的游戏
-            </PlatformActionButton>
-          ) : null}
           <label className="game-search">
             <Search aria-hidden="true" />
             <input

src/components/game-distribution/gameDistribution.css

@@ -13,6 +13,13 @@
   margin: 0 auto;
 }
 
+.game-page-actions {
+  display: flex;
+  justify-content: flex-end;
+  gap: 0.6rem;
+  /* 站点级动作放在 hero 上方的右上角，与 hero 之间留出间距。 */
+  margin-bottom: 1.1rem;
+}
 .game-hero {
   position: relative;
   display: flex;