feat(ClubSettings): add member data quality requirements configuration

- Introduced new settings for member data quality requirements in club settings, allowing configuration of required fields such as street, postal code, city, phone, and email.
- Updated the backend to handle the new memberDataQualityRequirements field in club settings.
- Enhanced the frontend to display and manage these requirements in the ClubSettings view, improving user experience and data integrity.
- Added localization support for new terms related to member data quality across multiple languages.

backend/migrations/20260415_add_member_data_quality_requirements_to_clubs.sql

@@ -0,0 +1,6 @@
+-- Migration: Add per-club member data quality requirements.
+-- Controls which optional contact/address fields count as required on /members.
+
+ALTER TABLE clubs
+  ADD COLUMN IF NOT EXISTS member_data_quality_requirements JSON NULL
+    COMMENT 'Configures which member fields are required for data quality checks';