refactor: align import paths with module name

tools/nidusctl/main.go

@@ -13,9 +13,9 @@ import (
 	"os"
 	"path/filepath"
 
-	"github.com/yourusername/caldav-server/internal/config"
-	"github.com/yourusername/caldav-server/internal/db"
-	"github.com/yourusername/caldav-server/internal/store"
+	"git.arnef.de/arnef/nidus/internal/config"
+	"git.arnef.de/arnef/nidus/internal/db"
+	"git.arnef.de/arnef/nidus/internal/store"
 )
 
 func main() {

tools/nidusctl/main_test.go

@@ -9,7 +9,7 @@ import (
 	"strings"
 	"testing"
 
-	"github.com/yourusername/caldav-server/internal/db"
+	"git.arnef.de/arnef/nidus/internal/db"
 )
 
 // writeTestConfig creates a minimal config.yaml in dir and returns its path.

tools/nidusctl/users.go

@@ -6,7 +6,7 @@ import (
 	"os"
 	"strings"
 
-	"github.com/yourusername/caldav-server/internal/db"
+	"git.arnef.de/arnef/nidus/internal/db"
 	"golang.org/x/term"
 )