initial support for ips server

[sjzar]

• 新增 HTTP 服务支持
  • 通过 ips server 命令启动 HTTP 服务，提供 IP 查询 API 与查询页面
  • 内置查询页面，无需额外文件依赖
  • 新增两 API：GET /api/v1/ip?ip=<ip> (单一 IP 查询) 和 GET /api/v1/query?text=<text> (文本批量查询)
• 重构 ips 查询函数，以适配 server 功能
• 修复：移除 ipnet.PrevIP 和 ipnet.NextIP 中的 IPv4 判断，防止 IPv4 + IPv6 数据库文件转存循环

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• Introduced HTTP service support
  • Launch HTTP service using the ips server command, offering IP lookup API and a search page
  • Integrated search page, eliminating the need for additional file dependencies
  • Added two APIs: GET /api/v1/ip?ip=<ip> (single IP lookup) and GET /api/v1/query?text=<text> (bulk text search)
• Refactored ips query functions to accommodate the server feature
• Fix: Removed IPv4 checks in ipnet.PrevIP and ipnet.NextIP to prevent looping with IPv4 + IPv6 database file transfers