Strip trailing slash from PVE host URLs

A trailing slash in --pve.host (e.g. https://host:8006/) caused API
requests to fail with status 500 due to double slashes in the path.

collector/client.go

@@ -41,6 +41,11 @@ func NewClient(hosts []string, token string, tlsInsecure bool, maxConcurrent int
 		TLSHandshakeTimeout: 5 * time.Second,
 	}
 
+	// Normalize hosts: strip trailing slashes
+	for i, h := range hosts {
+		hosts[i] = strings.TrimRight(h, "/")
+	}
+
 	// Normalize token: ensure it has the PVEAPIToken= prefix
 	if !strings.HasPrefix(token, "PVEAPIToken=") {
 		token = "PVEAPIToken=" + token