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

domain/aggregates.go

@@ -5,7 +5,7 @@ import (
 	"strings"
 	"time"
 
-	"gitlab.com/unboundsoftware/eventsourced/eventsourced"
+	"codeberg.org/eventsourced/eventsourced"
 )
 
 type Organization struct {

domain/commands.go

@@ -5,7 +5,7 @@ import (
 	"fmt"
 	"strings"
 
-	"gitlab.com/unboundsoftware/eventsourced/eventsourced"
+	"codeberg.org/eventsourced/eventsourced"
 
 	"gitea.unbound.se/unboundsoftware/schemas/hash"
 )

domain/commands_test.go

@@ -5,9 +5,9 @@ import (
 	"strings"
 	"testing"
 
+	"codeberg.org/eventsourced/eventsourced"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
-	"gitlab.com/unboundsoftware/eventsourced/eventsourced"
 
 	"gitea.unbound.se/unboundsoftware/schemas/hash"
 )

domain/events.go

@@ -1,6 +1,6 @@
 package domain
 
-import "gitlab.com/unboundsoftware/eventsourced/eventsourced"
+import "codeberg.org/eventsourced/eventsourced"
 
 type OrganizationAdded struct {
 	eventsourced.BaseEvent

domain/events_test.go

@@ -4,9 +4,9 @@ import (
 	"testing"
 	"time"
 
+	"codeberg.org/eventsourced/eventsourced"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
-	"gitlab.com/unboundsoftware/eventsourced/eventsourced"
 )
 
 func TestOrganizationAdded_UpdateOrganization(t *testing.T) {