feat(elections): use static ADNL address by default

[Keshoid]

Summary

Static ADNL was added as an opt-in in SMA-81. This PR makes it the default: nodectl auto-generates and persists a static ADNL per node on the first election cycle and reuses it thereafter. The motivation is that rotating ADNL every cycle breaks the Rust node's fastsync — peers that knew the validator by its previous ADNL can't locate it after the swap.

Existing elections.static_adnls entries continue to work unchanged. Operators who want the old per-cycle ephemeral behavior for a specific node can opt out.

Design

Precedence per node, evaluated each tick:

1. Node is in the new elections.static_adnl_disabled set → fresh ephemeral ADNL each cycle (legacy behavior).
2. Node has a elections.static_adnls[node] entry → re-register that static address.
3. Neither → auto-generate one, persist it, then register.

Batched persistence. The runner has a per-tick "ensure static ADNL" prefix step. It collects all nodes missing a static ADNL (not disabled, not yet generated), generates each via the validator's control server, then persists every success in a single runtime_cfg.update_and_save(...) call — so 40 fresh nodes hit the config file once, not 40 times. After the first successful tick the step is a no-op.

Partial failure handling. If 38/40 succeed and 2 fail (e.g. control server temporarily unreachable), the 38 are saved; the 2 failed nodes skip this election cycle (their resolve_adnl_addr returns an error → that node's participation fails, others proceed). Next tick retries only the still-missing ones. Matches the existing pool_addr_cache pattern.

API

• POST /v1/elections/static-adnl — unchanged, generates/rotates the static ADNL. Now also clears static_adnl_disabled for the node (rotation re-enables the static default).
• DELETE /v1/elections/static-adnl/{node} — new — opt the node out of static ADNL.
• BindingElectionStatusDto gains static_adnl_disabled: bool, surfaced in GET /v1/elections/settings.

CLI

nodectl config elections static-adnl --node node0            # rotate / initialize
nodectl config elections static-adnl --node node0 --disable  # opt out

elections show now renders "disabled" in the Static ADNL column for opted-out nodes.

Closes SMA-87

[linear]

SMA-87

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