feat(cli): add verbose logging option for CLI commands

* Introduced a new flag `--verbose` to enable detailed logging.
* Implemented logging for connection events in SSE and stdio commands.
* Added a utility function to handle verbose logging.

internal/requestip/requestip.go

@@ -0,0 +1,76 @@
+package requestip
+
+import (
+	"net"
+	"net/http"
+	"strings"
+)
+
+// FromRequest returns the best-effort client IP/host for a request, preferring
+// proxy headers before falling back to RemoteAddr.
+//
+// Header precedence:
+// 1) X-Real-IP
+// 2) X-Forwarded-Host
+// 3) X-Forwarded-For (first value)
+// 4) Forwarded (for=...)
+// 5) RemoteAddr (host part)
+func FromRequest(r *http.Request) string {
+	if r == nil {
+		return ""
+	}
+
+	if v := firstAddressToken(r.Header.Get("X-Real-IP")); v != "" {
+		return stripPort(v)
+	}
+	if v := firstAddressToken(r.Header.Get("X-Forwarded-Host")); v != "" {
+		return stripPort(v)
+	}
+	if v := firstAddressToken(r.Header.Get("X-Forwarded-For")); v != "" {
+		return stripPort(v)
+	}
+	if v := forwardedForValue(r.Header.Get("Forwarded")); v != "" {
+		return stripPort(v)
+	}
+	return stripPort(strings.TrimSpace(r.RemoteAddr))
+}
+
+func firstAddressToken(v string) string {
+	if v == "" {
+		return ""
+	}
+	part := strings.TrimSpace(strings.Split(v, ",")[0])
+	part = strings.Trim(part, `"`)
+	return strings.TrimSpace(part)
+}
+
+func forwardedForValue(v string) string {
+	for _, part := range strings.Split(v, ",") {
+		for _, kv := range strings.Split(part, ";") {
+			k, raw, ok := strings.Cut(strings.TrimSpace(kv), "=")
+			if !ok || !strings.EqualFold(strings.TrimSpace(k), "for") {
+				continue
+			}
+			candidate := strings.Trim(strings.TrimSpace(raw), `"`)
+			if candidate == "" {
+				continue
+			}
+			return candidate
+		}
+	}
+	return ""
+}
+
+func stripPort(addr string) string {
+	addr = strings.TrimSpace(addr)
+	if addr == "" {
+		return ""
+	}
+	// RFC 7239 quoted values may wrap IPv6 with brackets.
+	addr = strings.Trim(addr, "[]")
+	host, _, err := net.SplitHostPort(addr)
+	if err == nil {
+		return host
+	}
+	return addr
+}