v0.1.17: security hardening — 18/20 vulnerabilities fixed

Phase 1 (Critical):
- #1 JWT auth (done in v0.1.16)
- #2 Batch message size validation in send_message_batch.go
- #10 RLock in GetQueueUrlV1 (data race fix)

Phase 2 (AWS-compatible limits):
- #3 QueueName validation: max 80 chars, [a-zA-Z0-9_-](.fifo)?
- #4 WaitTimeSeconds clamped to 0-20
- #5 ReceiveMessageWaitTimeSeconds clamped to 0-20
- #6 DelaySeconds clamped to 0-900
- #7 VisibilityTimeout clamped to 0-43200
- #8 MaxNumberOfMessages clamped to 1-10
- #9 Message attributes limited to 10 per message
- #15 BatchEntryId length validated (max 80)
- #16 DeduplicationID length validated (max 128)
- #17 GroupID length validated (max 128)

Phase 3 (Per-tenant resource limits):
- #11 Max messages per queue (120K standard, 20K FIFO)
- #12 Global tenant limit (1000)
- #3.5 HTTP request body size limit (1MB via MaxBytesReader)

Phase 4 (Stability):
- #14 Duplicates map cleanup (already in PeriodicTasks)
- #13 FIFO group lock timeout (already in visibility timeout reset)
- #18 Redis size guard: skip save if >50MB

Skipped (Low, no real risk):
- #19 {account} URL param (informational only, not used for access)
- #20 ReceiptHandle format (self-validating UUID#UUID)

New file: app/gosqs/validation.go — centralized AWS SQS limits and validators

app/gosqs/queue_attributes.go

@@ -14,23 +14,21 @@ import (
 //   - attr.Policy
 //   - attr.RedriveAllowPolicy
 func setQueueAttributesV1(q *models.Queue, attr models.QueueAttributes) error {
-	// FIXME - are there better places to put these bottom-limit validations?
+	// AWS-совместимые лимиты: clamp значений к допустимым диапазонам
 	if attr.DelaySeconds >= 0 {
-		q.DelaySeconds = attr.DelaySeconds.Int()
+		q.DelaySeconds = ClampInt(attr.DelaySeconds.Int(), 0, MaxDelaySeconds)
 	}
 	if attr.MaximumMessageSize >= 0 {
-		q.MaximumMessageSize = attr.MaximumMessageSize.Int()
+		q.MaximumMessageSize = ClampInt(attr.MaximumMessageSize.Int(), MinMessageSizeLimit, MaxMessageSizeLimit)
 	}
-	// TODO - bottom limit should be the AWS limits
-	// The following 2 don't support zero values
 	if attr.MessageRetentionPeriod > 0 {
-		q.MessageRetentionPeriod = attr.MessageRetentionPeriod.Int()
+		q.MessageRetentionPeriod = ClampInt(attr.MessageRetentionPeriod.Int(), MinMessageRetentionPeriod, MaxMessageRetentionPeriod)
 	}
 	if attr.ReceiveMessageWaitTimeSeconds > 0 {
-		q.ReceiveMessageWaitTimeSeconds = attr.ReceiveMessageWaitTimeSeconds.Int()
+		q.ReceiveMessageWaitTimeSeconds = ClampInt(attr.ReceiveMessageWaitTimeSeconds.Int(), 0, MaxReceiveMessageWaitTimeSeconds)
 	}
 	if attr.VisibilityTimeout >= 0 {
-		q.VisibilityTimeout = attr.VisibilityTimeout.Int()
+		q.VisibilityTimeout = ClampInt(attr.VisibilityTimeout.Int(), 0, MaxVisibilityTimeout)
 	}
 	if attr.RedrivePolicy != (models.RedrivePolicy{}) {
 		arnArray := strings.Split(attr.RedrivePolicy.DeadLetterTargetArn, ":")