Bring network storage up to main scope

[djeebus]

Note

Moves network storage selection to top-level, updates Pool to accept a Storage and adjusts local/KV storage constructors and call sites.

• Network:
  • Pool API: NewPool now accepts a Storage and no longer returns an error; internal storage creation removed.
  • Storage selection: Introduce newStorage(nodeID, config) in main.go to choose between StorageLocal and StorageKV based on env/config.
  • Constructors:
    • NewStorageLocal(config) and NewStorageKV(nodeID, config) now infer vrtSlotsSize internally (remove slotsSize arg).
    • Remove NewStorage factory from storage.go.
• Call sites:
  • Update orchestrator startup, build-template cmd, and benchmark to create storage (NewStorageLocal in non-prod paths) and pass it to network.NewPool.
  • Minor cleanup: remove unused UUID/clientID in benchmark.

^{Written by Cursor Bugbot for commit fd7a287. This will update automatically on new commits. Configure here.}