Move reverse proxy docs to PWA_NPS.md for NPS setup; remove bundled nginx config.

Co-authored-by: Cursor <cursoragent@cursor.com>

scripts/gen_ssl_cert.sh

@@ -1,34 +0,0 @@
-#!/usr/bin/env bash
-# 生成本地 HTTPS 自签证书（局域网 PWA 安装用）
-# 用法: sudo bash scripts/gen_ssl_cert.sh [服务器局域网IP]
-set -euo pipefail
-
-SERVER_IP="${1:-}"
-SSL_DIR="/etc/nginx/ssl"
-KEY="${SSL_DIR}/trading_studio.key"
-CRT="${SSL_DIR}/trading_studio.crt"
-
-if [[ "${EUID:-0}" -ne 0 ]]; then
-  echo "请使用 root: sudo bash scripts/gen_ssl_cert.sh 192.168.x.x"
-  exit 1
-fi
-
-if [[ -z "${SERVER_IP}" ]]; then
-  SERVER_IP=$(hostname -I | awk '{print $1}')
-  echo "[INFO] 未指定 IP，使用: ${SERVER_IP}"
-fi
-
-mkdir -p "${SSL_DIR}"
-
-openssl req -x509 -nodes -days 3650 -newkey rsa:2048 \
-  -keyout "${KEY}" \
-  -out "${CRT}" \
-  -subj "/CN=TradingStudio/O=Trading/C=CN" \
-  -addext "subjectAltName=IP:${SERVER_IP},DNS:trading.local,DNS:localhost"
-
-chmod 600 "${KEY}"
-echo "[OK] 证书已生成:"
-echo "  ${CRT}"
-echo "  ${KEY}"
-echo ""
-echo "手机/平板首次访问 HTTPS 需点「继续访问」信任自签证书，之后即可安装 App。"