fix: InvalidClientTokenId panic + VT defaults + Dockerfile config + hardcore tests (58/61)

- Add InvalidClientTokenId, ValidationError to SqsErrors (was causing panic: WriteHeader code 0)
- Extract applyEnvironmentDefaults() with defer in LoadYamlConfig (VT=30 even without config file)
- Dockerfile: copy goaws.yaml to /conf/, pass --config flag
- Fix SendMessageBatch form parsing for AWS Query Protocol
- Add hardcore_test.sh (61 tests, 14 groups)
- Remove temp debug logs from delete_message.go

shared-sqs/app/models/requests.go

@@ -230,8 +230,25 @@ type SendMessageBatchRequest struct {
 }
 
 func (r *SendMessageBatchRequest) SetAttributesFromForm(values url.Values) {
-	for entryIndex := range r.Entries {
-		r.Entries[entryIndex].MessageAttributes = parseMessageAttributes(values, fmt.Sprintf("Entries.%d.MessageAttributes", entryIndex))
+	// Парсим записи по AWS Query Protocol: SendMessageBatchRequestEntry.N.Id (1-based)
+	// Gorilla/schema с дефолтными тегами ищет Entries.0.Id, что не соответствует AWS SQS API.
+	for i := 1; ; i++ {
+		id := values.Get(fmt.Sprintf("SendMessageBatchRequestEntry.%d.Id", i))
+		if id == "" {
+			break
+		}
+		entry := SendMessageBatchRequestEntry{
+			Id:                     id,
+			MessageBody:            values.Get(fmt.Sprintf("SendMessageBatchRequestEntry.%d.MessageBody", i)),
+			MessageDeduplicationId: values.Get(fmt.Sprintf("SendMessageBatchRequestEntry.%d.MessageDeduplicationId", i)),
+			MessageGroupId:         values.Get(fmt.Sprintf("SendMessageBatchRequestEntry.%d.MessageGroupId", i)),
+		}
+		ds := values.Get(fmt.Sprintf("SendMessageBatchRequestEntry.%d.DelaySeconds", i))
+		if ds != "" {
+			entry.DelaySeconds, _ = strconv.Atoi(ds)
+		}
+		entry.MessageAttributes = parseMessageAttributes(values, fmt.Sprintf("SendMessageBatchRequestEntry.%d.MessageAttribute", i))
+		r.Entries = append(r.Entries, entry)
 	}
 }