refactor: migrate all remaining pkg/driver and pkg/tnsapi to NASty API

- Remove TrueNAS integer ID logic from all protocol controllers (NFS, NVMeOF, iSCSI, SMB)
- Fix NQN prefix: nqn.2026-02.csi.tns → nqn.2026-02.io.nasty.csi
- Fix controller tests: remove MockAPIClientForSnapshots (undefined), fix TestGenerateIQN IQN prefix
- Fix client_test.go: update TestQueryPool mock to use pool.get with NASty Pool struct
- Remove legacy snapshot/extent property references throughout

Author: fenio

.gitignore

@@ -4,7 +4,7 @@ CLAUDE.md
 .beads/
 
 # Credentials and secrets
-.tns-credentials
+.nasty-credentials
 *.local.yaml
 *.local.yml
 secret.local.*