add endpoint to manually trigger inventory collection

internal/vcenter/vcenter.go

@@ -3,7 +3,6 @@ package vcenter
 import (
 	"context"
 	"fmt"
-	"log"
 	"log/slog"
 	"net/url"
 	"path"
@@ -58,10 +57,19 @@ func New(logger *slog.Logger, creds *VcenterLogin) *Vcenter {
 }
 
 func (v *Vcenter) Login(vUrl string) error {
+	if v == nil {
+		return fmt.Errorf("vcenter is nil")
+	}
+	if strings.TrimSpace(vUrl) == "" {
+		return fmt.Errorf("vcenter URL is empty")
+	}
+	if v.credentials == nil {
+		return fmt.Errorf("vcenter credentials are nil")
+	}
 	// Connect to vCenter
 	u, err := soap.ParseURL(vUrl)
 	if err != nil {
-		log.Fatalf("Error parsing vCenter URL: %s", err)
+		return fmt.Errorf("error parsing vCenter URL: %w", err)
 	}
 	v.Vurl = vUrl