统一维护与错误页面并修复移动端顶部文案

新增品牌维护页和404页面并补齐网关路由
将临时维护公告迁到release外运行态覆盖并增加构建门禁
同步Nginx、Pingora、部署脚本与生产运维文档
隐藏移动端顶部SEO介绍并保留桌面端与H1语义
增加维护页、404页和移动端回归测试

deploy/nginx/genarrative-dev-http.conf

@@ -298,6 +298,7 @@ server {
 
     location / {
         error_page 503 /maintenance.html;
+        error_page 404 /404.html;
 
         if ($genarrative_maintenance) {
             return 503;

deploy/nginx/genarrative.conf

@@ -318,6 +318,7 @@ server {
 
     location / {
         error_page 503 /maintenance.html;
+        error_page 404 /404.html;
 
         if ($genarrative_maintenance) {
             return 503;

deploy/nginx/snippets/genarrative-maintenance.conf

@@ -10,7 +10,26 @@ if ($genarrative_internal_client) {
 }
 
 location = /maintenance.html {
-    root /srv/genarrative/web;
+    root /var/lib/genarrative/maintenance;
+    try_files /page.html @genarrative_default_maintenance;
+    add_header Cache-Control "no-store";
+    internal;
+}
+
+location @genarrative_default_maintenance {
+    root /srv/genarrative/web;
+    try_files /maintenance.html =503;
+    add_header Cache-Control "no-store";
+    internal;
+}
+
+location = /404.html {
+    if ($http_accept !~* "text/html") {
+        return 404;
+    }
+
+    root /srv/genarrative/web;
+    try_files /404.html =404;
     add_header Cache-Control "no-store";
     internal;
 }

deploy/pingora/pingora-gateway.env.example

@@ -25,6 +25,7 @@ GENARRATIVE_PINGORA_GATEWAY_SPACETIME_UPSTREAM=127.0.0.1:3101
 GENARRATIVE_PINGORA_GATEWAY_WEB_ROOT=/srv/genarrative/web
 GENARRATIVE_PINGORA_GATEWAY_ACME_ROOT=/var/www/html
 GENARRATIVE_PINGORA_GATEWAY_MAINTENANCE_FILE=/var/lib/genarrative/maintenance/enabled
+GENARRATIVE_PINGORA_GATEWAY_MAINTENANCE_PAGE_FILE=/var/lib/genarrative/maintenance/page.html
 
 GENARRATIVE_PINGORA_GATEWAY_FORWARDED_PROTO=http
 GENARRATIVE_PINGORA_GATEWAY_MAX_API_BODY_BYTES=67108864