feat(backend): add organization slugs

apps/backend/internal/organization/slug_test.go

@@ -0,0 +1,79 @@
+package organization
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestNormalizeSlug(t *testing.T) {
+	tests := []struct {
+		name    string
+		input   string
+		want    string
+		wantErr bool
+	}{
+		{
+			name:  "lowercases and trims",
+			input: "  Test-Org ",
+			want:  "test-org",
+		},
+		{
+			name:  "allows single char",
+			input: "a",
+			want:  "a",
+		},
+		{
+			name:  "allows max length",
+			input: strings.Repeat("a", 63),
+			want:  strings.Repeat("a", 63),
+		},
+		{
+			name:    "rejects empty",
+			input:   "",
+			wantErr: true,
+		},
+		{
+			name:    "rejects too long",
+			input:   strings.Repeat("a", 64),
+			wantErr: true,
+		},
+		{
+			name:    "rejects reserved",
+			input:   "my",
+			wantErr: true,
+		},
+		{
+			name:    "rejects invalid chars",
+			input:   "bad_slug",
+			wantErr: true,
+		},
+		{
+			name:    "rejects leading hyphen",
+			input:   "-bad",
+			wantErr: true,
+		},
+		{
+			name:    "rejects trailing hyphen",
+			input:   "bad-",
+			wantErr: true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := NormalizeSlug(tt.input)
+			if tt.wantErr {
+				if err == nil {
+					t.Fatalf("expected error, got none (slug=%q)", got)
+				}
+				return
+			}
+			if err != nil {
+				t.Fatalf("unexpected error: %v", err)
+			}
+			if got != tt.want {
+				t.Fatalf("unexpected slug: got %q want %q", got, tt.want)
+			}
+		})
+	}
+}