MV1: move contracts and sdk under modules/, importers follow

The delivery repository's contracts and SDK live under modules/ as
mesh-delivery-contracts and mesh-delivery-sdk, their Go module paths
renamed to match the folders (the TypeScript names already did), and
every importer in mesh-delivery, mesh-catalog, mesh-host, mesh-tools
and mesh-sdk follows in the same group: a design as it should be, one
path per module, checked by the group's check building every importer.

Builds: design 47 G §427, §88

Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h

modules/distribution/cmd/distribution-tools/contract.go

@@ -10,7 +10,7 @@ import (
 	"fmt"
 	"time"
 
-	reg "git.novox.be/novox/mesh-delivery/contracts/go/seats/containerimageregistry"
+	reg "git.novox.be/novox/mesh-delivery/modules/mesh-delivery-contracts/go/seats/containerimageregistry"
 
 	"distribution/internal/holder"
 )

modules/distribution/cmd/distribution-tools/contract_test.go

@@ -8,7 +8,7 @@ import (
 	"strings"
 	"testing"
 
-	reg "git.novox.be/novox/mesh-delivery/contracts/go/seats/containerimageregistry"
+	reg "git.novox.be/novox/mesh-delivery/modules/mesh-delivery-contracts/go/seats/containerimageregistry"
 
 	"distribution/internal/holder"
 )

modules/distribution/cmd/distribution-tools/main.go

@@ -20,8 +20,8 @@ import (
 
 	"git.novox.be/novox/mesh-contracts/health-and-repair/go/clients/meshhandactsclient"
 	meshconditions "git.novox.be/novox/mesh-contracts/health-and-repair/go/seats/meshconditions"
-	reg "git.novox.be/novox/mesh-delivery/contracts/go/seats/containerimageregistry"
-	"git.novox.be/novox/mesh-delivery/sdk/parts"
+	reg "git.novox.be/novox/mesh-delivery/modules/mesh-delivery-contracts/go/seats/containerimageregistry"
+	"git.novox.be/novox/mesh-delivery/modules/mesh-delivery-sdk/parts"
 	stdio "git.novox.be/novox/mesh-sdk/go"
 	"git.novox.be/novox/mesh-sdk/go/views"