Feat/464 react query hooks users settings

[mijinummi]

Closes #464

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React Query Hooks for Users and Settings (#464)

Objective

• Implement React Query hooks for user management and profile updates.

Changes

• Added useUsersList() → GET /api/users.
• Added useUpdateUserRole() → PATCH /api/users/:id/role (invalidates user list).
• Added useUpdateProfile() → PATCH /api/users/:id (updates Zustand store on success).
• Added useReportsSummary() → GET /api/reports/summary.
• Exported TypeScript types for reuse.

Acceptance Criteria

• ✅ Role change reflected in users table without reload.
• ✅ Profile update reflected in sidebar immediately.
• ✅ Types exported for reuse.

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