feat(cli): Add bandwidth limit function support

Added bandwidth limiting functionality, allowing users to limit the bandwidth of tunnel connections via the --bandwidth parameter.
Supported formats include: 1K/1KB (kilobytes), 1M/1MB (megabytes), 1G/1GB (gigabytes) or
Raw number (bytes).

internal/client/cli/http_test.go

@@ -0,0 +1,62 @@
+package cli
+
+import (
+	"testing"
+)
+
+func TestParseBandwidth(t *testing.T) {
+	tests := []struct {
+		input   string
+		want    int64
+		wantErr bool
+	}{
+		// Valid cases
+		{"", 0, false},
+		{"0", 0, false},
+		{"1024", 1024, false},
+		{"1K", 1024, false},
+		{"1KB", 1024, false},
+		{"1k", 1024, false},
+		{"1M", 1024 * 1024, false},
+		{"1MB", 1024 * 1024, false},
+		{"1m", 1024 * 1024, false},
+		{"10M", 10 * 1024 * 1024, false},
+		{"1G", 1024 * 1024 * 1024, false},
+		{"1GB", 1024 * 1024 * 1024, false},
+		{"500K", 500 * 1024, false},
+		{"100M", 100 * 1024 * 1024, false},
+		{" 1M ", 1024 * 1024, false},
+		{"1B", 1, false},
+		{"100B", 100, false},
+
+		// Error cases
+		{"invalid", 0, true},
+		{"abc", 0, true},
+		{"-1M", 0, true},
+		{"-100", 0, true},
+		{"1.5M", 0, true},
+		{"M", 0, true},
+		{"K", 0, true},
+		{"1T", 0, true},
+		{"1KM", 0, true},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.input, func(t *testing.T) {
+			got, err := parseBandwidth(tt.input)
+			if tt.wantErr {
+				if err == nil {
+					t.Errorf("parseBandwidth(%q) = %d, want error", tt.input, got)
+				}
+				return
+			}
+			if err != nil {
+				t.Errorf("parseBandwidth(%q) unexpected error: %v", tt.input, err)
+				return
+			}
+			if got != tt.want {
+				t.Errorf("parseBandwidth(%q) = %d, want %d", tt.input, got, tt.want)
+			}
+		})
+	}
+}