Override Update/Create/Delete on ExtendedClient to prevent panics

The upstream daptin-go-client panics on nil type assertion when the
server returns an error response (no "data" key). Override all three
methods to use ParseSingleResponse with proper nil checks and HTTP
status code handling.

Fixes #10

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: artpar

client/client.go

@@ -75,6 +75,36 @@ func (e *ExtendedClient) FindOne(tableName, referenceId string, parameters dapti
 	return ParseSingleResponse(resp.Body())
 }
 
+// Update overrides the upstream to handle error responses without panicking.
+func (e *ExtendedClient) Update(tableName, referenceId string, object daptinClient.JsonApiObject) (daptinClient.JsonApiObject, error) {
+	resp, err := e.nextRequest().SetBody(object).Patch(
+		e.Endpoint + "/api/" + tableName + "/" + referenceId,
+	)
+	if err := e.checkResponse(resp, err); err != nil {
+		return nil, err
+	}
+	return ParseSingleResponse(resp.Body())
+}
+
+// Create overrides the upstream to handle error responses without panicking.
+func (e *ExtendedClient) Create(tableName string, attributes daptinClient.JsonApiObject) (daptinClient.JsonApiObject, error) {
+	resp, err := e.nextRequest().SetBody(attributes).Post(
+		e.Endpoint + "/api/" + tableName,
+	)
+	if err := e.checkResponse(resp, err); err != nil {
+		return nil, err
+	}
+	return ParseSingleResponse(resp.Body())
+}
+
+// Delete overrides the upstream to add HTTP status checking.
+func (e *ExtendedClient) Delete(tableName, referenceId string) error {
+	resp, err := e.nextRequest().Delete(
+		e.Endpoint + "/api/" + tableName + "/" + referenceId,
+	)
+	return e.checkResponse(resp, err)
+}
+
 // MapArray extracts a named sub-map from each JsonApiObject.
 func MapArray(objects []daptinClient.JsonApiObject, keyName string) []map[string]interface{} {
 	result := make([]map[string]interface{}, 0, len(objects))