更新 Docker 镜像配置，清理 archive 文件

- 删除 archive/bbs-go 等历史代码
- 新增 nginx、frpc-client Docker 镜像配置
- 添加 .gitignore 忽略大文件

nginx/conf.d/gitea.conf

@@ -0,0 +1,16 @@
+server {
+    listen 80;
+    server_name gitea.membank.xyz;
+    client_max_body_size 200m;
+    location / {
+        proxy_pass http://gitea:3000;
+        proxy_connect_timeout 60s;
+        proxy_read_timeout 600s;
+        proxy_send_timeout 600s;
+
+        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;
+    }
+}