Standardize code formatting across all 173 Rust source files using rustfmt. No functional changes - purely cosmetic. This establishes a consistent code style baseline for the project going forward.
- Admin UI at /admin.html with settings management interface - REST API: GET/PUT /api/admin/settings/oidc, POST .../test, GET .../general - DB-backed settings in auth.admin_settings table (PostgreSQL) - OIDC auto-discovery from issuer URL (.well-known/openid-configuration) - Hot-reload: OIDC config changes apply without server restart - Role-based access: admin-only endpoints with 403 for regular users - Client secret stored securely, never exposed in GET responses - Env var override detection shown in admin UI - Clean architecture: repository trait, PG implementation, service, handler
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