User Story: Station Bot nomination audit log visibility

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User Story

As a guild owner or guild admin, I need to inspect nomination audit history from Station so that I can understand what nomination actions happened and who performed them.

Definition of Done

• Station exposes nomination audit event retrieval with filters for event type, time window, and result count/limit
• Audit filtering and empty/error states are covered by tests
• pnpm typecheck passes

Acceptance Criteria

• A guild admin can view nomination audit events from Station
• Audit events can be filtered similarly to the current bot-side audit command
• Results are presented newest-first and clearly identify the event type and actor context

Technical Elaboration

This ticket covers Station-side visibility into nomination audit history only. It does not include delegated access mutation or anti-abuse settings.

Design Elaboration

This screen should optimize for scanability. Admins should be able to quickly understand what happened without reading dense raw event payloads.

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Parent Epic: #231
Depends on: #232, #233, #242