feat(services): volume mounts + admin volume inventory (C1)

services.volumes JSONB [{type: volume|bind, source, target, read_only}]
mapped into every replica's container config at deploy and reconcile
time, hashed into the runtime spec so mount changes trigger
reconciliation. Mounted via existing docker.HostConfig.Mounts.

- RuntimeSpec.Volumes + specHash + mount.Mount mapping in createReplica
- Create/update service accepts volumes; PUT replaces the whole list
- Replica-count reconcile now goes through the deploy queue — the last
  raw `go` reconcile left that could race a build
- GET /admin/volumes inventories node volumes with in_use flags;
  DELETE /admin/volumes/:name removes unused ones (409 on in-use)
- CLI: services update --volume/--bind/--clear-volumes, volumes
  list|delete; MCP: services_update + volumes_list/delete
- Settings UI: Volumes section with mount editor
- Migration normalizes the nullable baseline column to NOT NULL [].

Verified live: deploy applies mounts to the container, docker
auto-creates named volumes, in-use deletion is refused.

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

app/backend/internal/deployment/runtime.go

@@ -17,6 +17,7 @@ import (
 
 	"github.com/docker/docker/api/types/container"
 	"github.com/docker/docker/api/types/filters"
+	"github.com/docker/docker/api/types/mount"
 	"github.com/docker/docker/api/types/network"
 	"github.com/docker/go-connections/nat"
 )
@@ -47,6 +48,7 @@ type RuntimeSpec struct {
 	RestartPolicy string
 	MemoryBytes   int64
 	NanoCPUs      int64
+	Volumes       []VolumeMount // applied to every replica
 }
 
 // RuntimeContainer describes one live replica.
@@ -245,6 +247,19 @@ func (de *DeploymentEngine) createReplica(ctx context.Context, spec RuntimeSpec,
 		Networks:      endpoints,
 	}
 
+	for _, v := range spec.Volumes {
+		mountType := mount.TypeVolume
+		if v.Type == "bind" {
+			mountType = mount.TypeBind
+		}
+		cfg.Mounts = append(cfg.Mounts, mount.Mount{
+			Type:     mountType,
+			Source:   v.Source,
+			Target:   v.Destination,
+			ReadOnly: v.ReadOnly,
+		})
+	}
+
 	var wantPort nat.Port
 	if spec.Port > 0 {
 		wantPort = nat.Port(fmt.Sprintf("%d/tcp", spec.Port))
@@ -474,8 +489,9 @@ func specHash(spec RuntimeSpec) string {
 		Env                                            map[string]string
 		Port                                           int32
 		MemoryBytes, NanoCPUs                          int64
+		Volumes                                        []VolumeMount
 	}{spec.Image, spec.Name, spec.Domain, spec.HealthPath, spec.RestartPolicy,
-		spec.Command, spec.Env, spec.Port, spec.MemoryBytes, spec.NanoCPUs})
+		spec.Command, spec.Env, spec.Port, spec.MemoryBytes, spec.NanoCPUs, spec.Volumes})
 	sum := sha256.Sum256(payload)
 	return hex.EncodeToString(sum[:8])
 }