server_config: 重写为完整部署规范（BBR/nginx CONNECT/sing-box/mtg）

- 新增完整 README.md 部署规范：架构、端口规划、BBR 跨境优化、
  nginx 源码编译+CONNECT 隧道、sing-box(VLESS+REALITY/SS)、mtg(MTProto)、
  本机 IP 自动识别、systemd、启动顺序与验证清单
- nginx/nginx.conf：占位符版，proxy_connect_allow all + 回环保护
- sing-box/config.json：占位符版，VLESS+REALITY + SS
- systemd/：nginx/sing-box/mtg 服务文件
- scripts/sync-nginx-local-ips.sh：去除真实域名，占位符版
- fake-site/index.html：伪装页（清除真实品牌域名）
- 移除过时：traffic-monitor/、pac/、conf.d 具体站点配置
- 所有敏感值（IP/域名/端口/密钥）均以 <占位符> 表示

server_config/sing-box/config.json

@@ -1,6 +1,6 @@
 {
   "log": {
-    "level": "warn",
+    "level": "info",
     "timestamp": true
   },
   "inbounds": [
@@ -8,7 +8,7 @@
       "type": "vless",
       "tag": "vless-reality-in",
       "listen": "0.0.0.0",
-      "listen_port": 8443,
+      "listen_port": "<vless端口>",
       "users": [
         {
           "uuid": "<VLESS_UUID>",
@@ -17,11 +17,11 @@
       ],
       "tls": {
         "enabled": true,
-        "server_name": "www.apple.com",
+        "server_name": "<伪装SNI域名>",
         "reality": {
           "enabled": true,
           "handshake": {
-            "server": "www.apple.com",
+            "server": "<伪装SNI域名>",
             "server_port": 443
           },
           "private_key": "<REALITY_PRIVATE_KEY>",
@@ -30,6 +30,14 @@
           ]
         }
       }
+    },
+    {
+      "type": "shadowsocks",
+      "tag": "ss-in",
+      "listen": "0.0.0.0",
+      "listen_port": "<ss端口>",
+      "method": "aes-256-gcm",
+      "password": "<SS_PASSWORD>"
     }
   ],
   "outbounds": [