refactor: migrate eventsourced to codeberg and go-messaging-amqp

Move eventsourced modules from gitlab.com/unboundsoftware to codeberg.org/eventsourced.
The Codeberg amqp publisher is built on go-messaging-amqp, so the service
switches from sparetimecoders/goamqp as well:

- routing keys are mapped on the eventsourced publisher (newEventPublisher)
- cache consumers are typed handlers; Cache.Update drops the goamqp shape
- publishes detach from the request context (uncancelledPublisher)
- closeEvents is buffered and the receiver also watches rootCtx
- WithPrefetchLimit dropped (no-op, 20 is the default)
- amqp091-go v1.15.0 (GO-2026-6372)
- renovate groups codeberg.org/messaging with eventsourced

Only transient consumer queues are used, so no queue cutover is needed.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Dpb7Y47dPz246oY9bCzh7k

middleware/auth_test.go

@@ -6,13 +6,13 @@ import (
 	"net/http/httptest"
 	"testing"
 
+	"codeberg.org/eventsourced/eventsourced"
 	"github.com/auth0/go-jwt-middleware/v3/core"
 	"github.com/auth0/go-jwt-middleware/v3/validator"
 	"github.com/google/uuid"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/mock"
 	"github.com/stretchr/testify/require"
-	"gitlab.com/unboundsoftware/eventsourced/eventsourced"
 
 	"gitea.unbound.se/unboundsoftware/schemas/domain"
 )