Add reclamation window to provider status API

[linear]

Why

Clients need a stable API field to read a provider's reclamation window from status before screening or bidding.

What

Add a nullable reclamation_window field to the top-level provider status API (akash.provider.v1.Status, not BidEngineStatus) and to the legacy REST ProviderStatus. A nil/omitted value means the provider does not offer reclamation.

Acceptance Criteria

• Go, TS, and Rust generated provider status bindings include the field.
• Tests cover protobuf serialization of the new field.

[linear]

from chalabi:

akash-network/chain-sdk#326