host api alignment (#7)

* feat: add Firecracker API client methods for VM pause/resume and snapshots

Add PatchVm, GetVm, PutSnapshotCreate, and PutSnapshotLoad methods to the
API client, along with supporting types (VmState, SnapshotCreateParams,
SnapshotLoadParams, MemBackend).

* feat: add snapshot data layer - contract types, model, store, config

Add SnapshotID and snapshot contract types, SnapshotRecord model,
store interface CRUD methods with file store implementation,
snapshot paths helper, SnapshotsDir config, and directory creation.

* feat: add runtime methods for VM pause, resume, snapshot, and restore

Implement Pause, Resume, CreateSnapshot, and RestoreBoot on the
firecracker Runtime. RestoreBoot launches a jailer, stages snapshot
files into the chroot, loads the snapshot, and resumes the VM.

* feat: add daemon snapshot create, restore, and reconciliation logic

Implement CreateSnapshot (pause, snapshot, COW-copy disk, resume),
RestoreSnapshot (COW-copy disk, RestoreBoot, wait for guest),
GetSnapshot, ListSnapshots, DeleteSnapshotByID, and crash recovery
reconciliation for snapshot and restore operations.

* feat: add HTTP endpoints for snapshot create, get, list, delete, restore

Wire 5 snapshot routes: POST /machines/{id}/snapshots (create),
GET /machines/{id}/snapshots (list), GET /snapshots/{id} (get),
DELETE /snapshots/{id} (delete), POST /snapshots/{id}/restore (restore).

* fix: cross-device rename, restore network, and snapshot cleanup

- Replace os.Rename with copy+remove for moving snapshot files out of
  /proc/<pid>/root/ (cross-device link error on Linux)
- Reconfigure network interface after snapshot load so the restored VM
  uses its own tap device instead of the source VM's
- Clean partial snapshot dirs immediately on failure instead of only
  via reconcile
- Reject snapshot requests while a machine operation is already pending

* fix: test and modify snapshot runtime

* feat: snapshot lifecycle update, align runtime issues between host image
and daemon

internal/model/types.go

@@ -53,13 +53,28 @@ type VolumeRecord struct {
 type MachineOperation string
 
 const (
-	MachineOperationCreate MachineOperation = "create"
-	MachineOperationStop   MachineOperation = "stop"
-	MachineOperationDelete MachineOperation = "delete"
+	MachineOperationCreate   MachineOperation = "create"
+	MachineOperationStop     MachineOperation = "stop"
+	MachineOperationDelete   MachineOperation = "delete"
+	MachineOperationSnapshot MachineOperation = "snapshot"
+	MachineOperationRestore  MachineOperation = "restore"
 )
 
-type OperationRecord struct {
-	MachineID contracthost.MachineID
-	Type      MachineOperation
-	StartedAt time.Time
+type SnapshotRecord struct {
+	ID                contracthost.SnapshotID
+	MachineID         contracthost.MachineID
+	Artifact          contracthost.ArtifactRef
+	MemFilePath       string
+	StateFilePath     string
+	DiskPaths         []string
+	SourceRuntimeHost string
+	SourceTapDevice   string
+	CreatedAt         time.Time
+}
+
+type OperationRecord struct {
+	MachineID  contracthost.MachineID
+	Type       MachineOperation
+	StartedAt  time.Time
+	SnapshotID *contracthost.SnapshotID `json:"snapshot_id,omitempty"`
 }