User Story: Station Bot RSI URL pattern configuration

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User Story

As a Station super admin, I need to manage RSI URL pattern configuration so that Station-Bot uses the correct RSI endpoints and link patterns for verification-related workflows.

Definition of Done

• Station exposes RSI_CITIZEN_URL_PATTERN, RSI_PROFILE_EDIT_URL, and RSI_ORGANIZATIONS_URL_PATTERN
• Validation and save/reload flows are covered by tests
• Guild owners/admins cannot access these controls
• pnpm typecheck passes

Acceptance Criteria

• A station_super_admin can update RSI URL pattern settings from Station
• Invalid values are rejected with field-level validation
• Guild-scoped admins cannot access these controls

Technical Elaboration

This ticket covers RSI URL/pattern settings only. It is separate from RSI HTTP timeout/retry/concurrency tuning.

Design Elaboration

These controls should make it clear that they affect external integration link targets and parsing behavior, not end-user guild settings.

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