Fix goconst linter warnings by converting repeated strings to constants

- Added testUserAlice constant for 'alice' in test files
- Added windowsOS constant for 'windows' in test files
- Added testIssueBD1/testIssueBD2 constants for 'bd-1'/'bd-2' in test files
- Added testVersion100 constant for '1.0.0' in version tests
- Added testIssueCustom1 constant for 'custom-1' in lazy init tests

Closes bd-54

Amp-Thread-ID: https://ampcode.com/threads/T-0a4e5d44-2d95-4948-8f4a-d8facf8657c7
Co-authored-by: Amp <amp@ampcode.com>

internal/storage/sqlite/events_test.go

@@ -7,6 +7,8 @@ import (
 	"github.com/steveyegge/beads/internal/types"
 )
 
+const testUserAlice = "alice"
+
 func TestAddComment(t *testing.T) {
 	store, cleanup := setupTestDB(t)
 	defer cleanup()
@@ -26,7 +28,7 @@ func TestAddComment(t *testing.T) {
 	}
 
 	// Add a comment
-	err = store.AddComment(ctx, issue.ID, "alice", "This is a test comment")
+	err = store.AddComment(ctx, issue.ID, testUserAlice, "This is a test comment")
 	if err != nil {
 		t.Fatalf("AddComment failed: %v", err)
 	}
@@ -55,7 +57,7 @@ func TestAddComment(t *testing.T) {
 		t.Fatal("Comment event not found")
 	}
 
-	if commentEvent.Actor != "alice" {
+	if commentEvent.Actor != testUserAlice {
 		t.Errorf("Expected actor 'alice', got '%s'", commentEvent.Actor)
 	}