Removed in-app account deletion implementation.
Reason: WellNuo uses B2B model where:
- Accounts created by company staff after contract signing
- Account deletion is part of service contract termination
- Handled through customer support, not self-service
Updated APPLE_REVIEW_RESPONSE.md with B2B exception explanation
for Apple Guidelines 5.1.1(v) and 3.1.1.
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