新增「原版与二创对比」页与路由登记（含 nginx×3 + Pingora allowlist）

- 新增路由 /games/compare（stage game-compare）：STAGE_ROUTE_ENTRIES + SelectionStage 类型 + 壳层 lazy 引入/导航回调/渲染分支 + 页面标题，四处同批登记
- 三份 nginx SPA allowlist（deploy/nginx/genarrative.conf、deploy/nginx/genarrative-dev-http.conf、deploy/container/nginx.conf）与 Pingora MAIN_SPA_PATHS 同步放行 /games/compare（保持既有排序）：check:nginx-spa-routes 18 SPA routes、check:pingora-route-parity 均绿
- 对比页左右两侧各自取数与降级：任一侧不可读（不存在/未公开/已软删除）或没有可玩版本时只降级那一侧，另一侧照常；显示标题、作者与代际；桌面左右并排、窄屏上下堆叠
- iframe 复用游玩页同一份嵌入：抽出 GamePlayFrame（sandbox=allow-scripts、allow=fullscreen、referrerPolicy=no-referrer、.game-player-frame），游玩页改为渲染它，不再存在第二套嵌入逻辑
- 入口：二创作品详情页在存在父作品时给出「与原版对比」；族谱节点仅在其父作品可见时给出同一入口
- 测试：对比页两侧渲染与 iframe 复用属性、单侧降级后另一侧照常；详情页入口（有/无父作品）；族谱节点入口（父可见才出现）；路由与标题登记；壳层「族谱节点→对比页」导航与对比 stage 渲染
- 顺手：按 eslint 自动修复两个文件的 import 排序

deploy/container/nginx.conf

@@ -157,7 +157,7 @@ http {
             try_files /index.html =404;
         }
 
-        location ~* "^/(?:creation|editor/canvas|pay|profile|profile/payment|project|components|design-system|creators|creators/connections|games|games/detail|games/lineage|games/mine|games/play|games/publish)/?$" {
+        location ~* "^/(?:creation|editor/canvas|pay|profile|profile/payment|project|components|design-system|creators|creators/connections|games|games/compare|games/detail|games/lineage|games/mine|games/play|games/publish)/?$" {
             try_files $uri /index.html =404;
         }
 

deploy/nginx/genarrative-dev-http.conf

@@ -206,7 +206,7 @@ server {
         try_files /index.html =404;
     }
 
-    location ~* "^/(?:creation|editor/canvas|pay|profile|profile/payment|project|components|design-system|creators|creators/connections|games|games/detail|games/lineage|games/mine|games/play|games/publish)/?$" {
+    location ~* "^/(?:creation|editor/canvas|pay|profile|profile/payment|project|components|design-system|creators|creators/connections|games|games/compare|games/detail|games/lineage|games/mine|games/play|games/publish)/?$" {
         error_page 503 /maintenance.html;
 
         if ($genarrative_maintenance) {

deploy/nginx/genarrative.conf

@@ -234,7 +234,7 @@ server {
         try_files /index.html =404;
     }
 
-    location ~* "^/(?:creation|editor/canvas|pay|profile|profile/payment|project|components|design-system|creators|creators/connections|games|games/detail|games/lineage|games/mine|games/play|games/publish)/?$" {
+    location ~* "^/(?:creation|editor/canvas|pay|profile|profile/payment|project|components|design-system|creators|creators/connections|games|games/compare|games/detail|games/lineage|games/mine|games/play|games/publish)/?$" {
         error_page 503 /maintenance.html;
 
         if ($genarrative_maintenance) {