feat: Prism HTTP/SOCKS5 代理网关及管理台

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

internal/api/client_ip.go

@@ -0,0 +1,23 @@
+package api
+
+import (
+	"net"
+	"strings"
+
+	"github.com/gin-gonic/gin"
+)
+
+func clientIP(c *gin.Context) string {
+	if xff := c.GetHeader("X-Forwarded-For"); xff != "" {
+		parts := strings.Split(xff, ",")
+		return strings.TrimSpace(parts[0])
+	}
+	if xri := strings.TrimSpace(c.GetHeader("X-Real-IP")); xri != "" {
+		return xri
+	}
+	host, _, err := net.SplitHostPort(c.Request.RemoteAddr)
+	if err != nil {
+		return c.Request.RemoteAddr
+	}
+	return host
+}