docs(deploy): 文本事件流 - 补充 SSE 反向代理与断线恢复指南 (#143)

Fixes #143

nginx.conf

@@ -35,6 +35,22 @@ server {
         proxy_read_timeout 3600s;
     }
 
+    # 文本任务事件流必须逐条转发；该规则只作用于 SSE，不改变其他 API 的缓存和超时策略。
+    location ~ ^/api/tasks/[^/]+/text-events$ {
+        proxy_pass http://backend:8080;
+        proxy_http_version 1.1;
+        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 $canvas_forwarded_proto;
+        proxy_set_header X-Forwarded-Host $host;
+        proxy_buffering off;
+        proxy_cache off;
+        gzip off;
+        proxy_read_timeout 3600s;
+        proxy_send_timeout 3600s;
+    }
+
     location /api/ {
         proxy_pass http://backend:8080;
         proxy_http_version 1.1;