fix(docker): ensure docs llms text files use UTF-8 charset (#9020)

docker/nocobase/nocobase-docs.conf

@@ -51,6 +51,22 @@ server {
     etag off;
   }
 
+  # 专门针对 txt 文件的路由
+  location ~ \.txt$ {
+    root /app/nocobase/docs;
+    
+    # 清空默认的 types 映射，强制指定带有 charset 的 Content-Type
+    types { }
+    default_type "text/plain; charset=utf-8";
+
+    # 保持原有的头部控制逻辑
+    add_header Last-Modified $date_gmt;
+    add_header Cache-Control 'no-store, no-cache';
+    if_modified_since off;
+    expires off;
+    etag off;
+  }
+
   location / {
     root /app/nocobase/docs;
     try_files $uri $uri.html $uri/index.html /index.html;