valoper: unify duplicate per-valoper profile fetch (signing address + server type)

[louis14448]

Context

Code review of branch fix/valoper-signing-address-moniker (moniker resolution by signing address). Non-blocking follow-up.

Problem

Two code paths independently fan out one RPC call per valoper to fetch the same valoper profile render on every moniker refresh:

• enrichValoperSigningAddresses — internal/gnovalidator/valoper.go — via vm/qeval valopers.Render("<addr>"), parses Signing Address.
• enrichValidatorInfoFromValopers — internal/gnovalidator/health.go:389 — via vm/qrender, parses Server Type.

Each profile is therefore fetched twice per refresh cycle, doubling RPC round-trips for the same data.

Suggested fix

Unify into a single per-valoper fetch that parses both Signing Address and Server Type from one render, shared by both consumers.

Aside

The parse-format doc comment at health.go:~415 is now stale: the render uses - Operator Address: / - Signing Address:, not - Address: / - PubKey:.

Severity: medium (RPC efficiency / duplication).