Replace BLite with Surreal embedded persistence

samples/ZB.MOM.WW.CBDDC.Sample.Console/README.md

@@ -56,7 +56,15 @@ Terminal 3:
 dotnet run -- --node-id node3 --tcp-port 5003 --udp-port 6003
 ```
 
-Changes made on any node will automatically sync to all peers!
+Changes made on any node will automatically sync to all peers!
+
+### Import Snapshot Into Surreal (Migration Utility)
+
+```bash
+dotnet run -- --migrate-snapshot /path/to/snapshot.json --target-db /path/to/data.rocksdb
+```
+
+This imports a CBDDC snapshot into embedded Surreal RocksDB and validates parity (counts plus oplog hash spot checks).
 
 ## Available Commands
 
@@ -149,7 +157,7 @@ var page = await users.Find(u => true, skip: 10, take: 5);
 
 ## Architecture
 
-- **Storage**: SQLite with HLC timestamps
+- **Storage**: Surreal embedded RocksDB with HLC timestamps
 - **Sync**: TCP for data transfer, UDP for discovery
 - **Conflict Resolution**: Last-Write-Wins based on Hybrid Logical Clocks
 - **Serialization**: System.Text.Json