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_test.go

@@ -0,0 +1,47 @@
+package requestip
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+)
+
+func TestFromRequestPrefersXRealIP(t *testing.T) {
+	req := httptest.NewRequest(http.MethodGet, "/", nil)
+	req.RemoteAddr = "10.0.0.10:5555"
+	req.Header.Set("X-Forwarded-Host", "proxy.example.com")
+	req.Header.Set("X-Real-IP", "203.0.113.10")
+
+	if got := FromRequest(req); got != "203.0.113.10" {
+		t.Fatalf("FromRequest() = %q, want %q", got, "203.0.113.10")
+	}
+}
+
+func TestFromRequestUsesXForwardedHostWhenRealIPMissing(t *testing.T) {
+	req := httptest.NewRequest(http.MethodGet, "/", nil)
+	req.RemoteAddr = "10.0.0.10:5555"
+	req.Header.Set("X-Forwarded-Host", "203.0.113.22")
+
+	if got := FromRequest(req); got != "203.0.113.22" {
+		t.Fatalf("FromRequest() = %q, want %q", got, "203.0.113.22")
+	}
+}
+
+func TestFromRequestUsesXForwardedForFirstValue(t *testing.T) {
+	req := httptest.NewRequest(http.MethodGet, "/", nil)
+	req.RemoteAddr = "10.0.0.10:5555"
+	req.Header.Set("X-Forwarded-For", "198.51.100.7, 10.1.1.2")
+
+	if got := FromRequest(req); got != "198.51.100.7" {
+		t.Fatalf("FromRequest() = %q, want %q", got, "198.51.100.7")
+	}
+}
+
+func TestFromRequestFallsBackToRemoteAddr(t *testing.T) {
+	req := httptest.NewRequest(http.MethodGet, "/", nil)
+	req.RemoteAddr = "192.0.2.5:1234"
+
+	if got := FromRequest(req); got != "192.0.2.5" {
+		t.Fatalf("FromRequest() = %q, want %q", got, "192.0.2.5")
+	}
+}