fix: 永久修复 nginx proxy_pass 配置

- staging nginx.conf: 使用静态 proxy_pass 替代变量型（避免 URI 丢失）
- staging 指向容器名 xiaoxia-api-staging（避免 DNS 别名冲突）
- 添加 proxy_read_timeout/proxy_send_timeout 300s（与 production 对齐）
- web.Dockerfile: 支持 ARG NGINX_CONF 参数化（与 web-artifact.Dockerfile 一致）
- production nginx-production.conf 已确认无需修改

infra/docker/nginx.conf

@@ -18,16 +18,19 @@ server {
     }
 
     # API proxy
-    # Docker DNS resolver - refresh every 10s to handle container IP changes
+    # Use static proxy_pass with container name to avoid URI stripping issues
+    # that occur with variable-based proxy_pass (set $upstream ...).
+    # DNS resolver kept for container IP refresh on restart.
     resolver 127.0.0.11 valid=10s;
     resolver_timeout 5s;
     location /api/ {
-        set $upstream http://api:8000;
-        proxy_pass $upstream/api/;
+        proxy_pass http://xiaoxia-api-staging:8000/api/;
         proxy_set_header Host $host;
         proxy_set_header X-Real-IP $remote_addr;
         proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
         proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_read_timeout 300s;
+        proxy_send_timeout 300s;
         proxy_request_buffering off;
     }
 
@@ -36,4 +39,4 @@ server {
         expires 1y;
         add_header Cache-Control "public, immutable";
     }
-}
+}

infra/docker/web.Dockerfile

@@ -12,8 +12,9 @@ RUN npm run build
 
 # Production stage with nginx
 FROM docker.m.daocloud.io/library/nginx:alpine AS runner
+ARG NGINX_CONF=infra/docker/nginx.conf
 WORKDIR /usr/share/nginx/html
 COPY --from=builder /app/apps/web/dist ./
-COPY infra/docker/nginx.conf /etc/nginx/conf.d/default.conf
+COPY ${NGINX_CONF} /etc/nginx/conf.d/default.conf
 EXPOSE 80
 CMD ["nginx", "-g", "daemon off;"]