serviceability: rename NewInterface to Interface and old enum to InterfaceDeprecated

[elitegreg]

Part of the forward-compatible Device interfaces refactor.
Design: https://gist.github.com/elitegreg/e1d27c97034656a980fa8d7628ae16c5

Depends on #3658, #3659, #3660, #3661, #3662.

Scope

Pure rename. Swap the working-name NewInterface to Interface and the legacy enum from Interface to InterfaceDeprecated. Same for vec field names: new_interfaces → interfaces and old interfaces → deprecated_interfaces. All trait impls and call sites follow.

This is the cross-cutting churn step the earlier issues were structured to defer.

Tasks

• smartcontract/programs/doublezero-serviceability/src/state/interface.rs: rename types.
• smartcontract/programs/doublezero-serviceability/src/state/device.rs: rename fields.
• All processors, CLI, sentinel, client, admin, Rust SDK call sites: rename references.
• All Rust tests: rename references; fix tests broken purely by the rename.
• Activator (deprecated, minimal touch): rename references so it continues to compile. Use deprecated_interfaces where it currently reads interfaces. Do not migrate it to use the new (now-renamed) Interface struct or interfaces vec.
• SDKs: rename equivalents in Go (Interface / DeprecatedInterface if surfaced), Python, TS as needed for parity.
• JSON serde shape: Device JSON now exposes interfaces (new shape) and deprecated_interfaces (legacy projection). Update CLI renderers / telemetry consumers if their schema assumed the old layout.

Notes

• Mechanical PR. Likely large but reviewable as a rename. If split, do it along Rust workspace vs. SDK lines.
• After this lands, the Future cleanup section in the design (collapse legacy vec to skip-only, drop dual writes) becomes possible — gated on every device account being re-written at least once.