回滚误入 master 的游戏分发 WIP（夹带在 OSS v1 签名提交里）

- 撤销 39aed2e48 夹带的游戏分发前后端、SpacetimeDB 绑定、主站路由、后台审核页、文档与 nginx 改动，master 恢复可编译状态
- 保留该提交自身的 AGC 发号改动：agc-global-version.mjs 与其参数构造单测
- 恢复被误删的 output 产物，避免把无关清理混进该提交
- 补回两篇技术文档在 docs/README.md 的索引（它们属于后续两个补提交文档，不属于游戏分发）
- 游戏分发完整实现保留在 codex/game-distribution 分支继续开发

src/routing/activeAppPageRoutes.test.ts

@@ -22,13 +22,6 @@ describe('appPageRoutes', () => {
     expect(resolveSelectionStageFromPath('/EDITOR/CANVAS/')).toBe(
       'image-editor',
     );
-    expect(resolveSelectionStageFromPath('/games')).toBe('games');
-    expect(resolveSelectionStageFromPath('/games/detail/')).toBe('game-detail');
-    expect(resolveSelectionStageFromPath('/games/play')).toBe('game-play');
-    expect(resolveSelectionStageFromPath('/games/mine')).toBe('game-mine');
-    expect(resolveSelectionStageFromPath('/games/publish')).toBe(
-      'game-publish',
-    );
     expect(resolveSelectionStageFromPath('/creation/rpg')).toBe('platform');
     expect(resolveSelectionStageFromPath('/runtime/puzzle')).toBe('platform');
     expect(isKnownMainAppPagePath('/creation')).toBe(true);
@@ -38,9 +31,6 @@ describe('appPageRoutes', () => {
     expect(resolvePathForSelectionStage('creation-home')).toBe('/creation');
     expect(resolvePathForSelectionStage('project')).toBe('/project');
     expect(resolvePathForSelectionStage('profile')).toBe('/profile');
-    expect(resolvePathForSelectionStage('games')).toBe('/games');
-    expect(resolvePathForSelectionStage('game-mine')).toBe('/games/mine');
-    expect(resolvePathForSelectionStage('game-publish')).toBe('/games/publish');
   });
 
   it('requires a project id for direct editor navigation', () => {

src/routing/activeAppPageRoutes.ts

@@ -9,11 +9,6 @@ const STAGE_ROUTE_ENTRIES = [
   ['project', '/project'],
   ['profile', '/profile'],
   ['image-editor', '/editor/canvas'],
-  ['games', '/games'],
-  ['game-detail', '/games/detail'],
-  ['game-play', '/games/play'],
-  ['game-mine', '/games/mine'],
-  ['game-publish', '/games/publish'],
 ] as const satisfies readonly (readonly [SelectionStage, string])[];
 
 export const APP_STAGE_ROUTES: Record<SelectionStage, string> =