docs(部署方案): 同步 NAS+甲骨文反代决策 + 生成部署骨架

- SRS/SDD/README/PROGRESS 统一将部署目标由"美国服务器"更正为"NAS 本机 + 甲骨文服务器反向代理"（此前已确认但未入库）
- 新增 docker-compose.yml / nginx.conf / .env.example（对应待办任务4）
- 相对 SDD 草稿的安全加固：one-api 端口改绑 127.0.0.1（原为公网端口映射），lobe-chat 不再发布主机端口，仅走容器内网

nginx.conf

@@ -0,0 +1,52 @@
+user  nginx;
+worker_processes  auto;
+
+error_log  /var/log/nginx/error.log notice;
+pid        /var/run/nginx.pid;
+
+events {
+    worker_connections  1024;
+}
+
+http {
+    include       /etc/nginx/mime.types;
+    default_type  application/octet-stream;
+
+    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
+                       '$status $body_bytes_sent "$http_referer" '
+                       '"$http_user_agent" "$http_x_forwarded_for"';
+
+    access_log  /var/log/nginx/access.log  main;
+
+    sendfile        on;
+    keepalive_timeout  65;
+
+    # 域名/IP 未确定前，先用 _ 通配 server_name（见 SDD 8.4 待确认事项）
+    server {
+        listen 443 ssl;
+        server_name _;
+
+        ssl_certificate     /etc/nginx/certs/fullchain.pem;
+        ssl_certificate_key /etc/nginx/certs/privkey.pem;
+
+        location / {
+            proxy_pass http://lobe-chat:3210;
+            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 $scheme;
+
+            # 关闭缓冲/缓存以支持流式输出（SSE）
+            proxy_buffering off;
+            proxy_cache off;
+            proxy_read_timeout 300s;
+        }
+    }
+
+    server {
+        listen 80;
+        server_name _;
+        return 301 https://$host$request_uri;
+    }
+}