feat(service-professional): Remove staff_id/staff_code from OTP login response

feat(service-professional): Migrate from staff_id/staff_code to partner_id identifier

feat(service-professional): Add staff_id to JWT token payload

feat(service-professional): Add OTP-based authentication system for service professionals

feat(wati): Add employee credentials delivery via WhatsApp

feat(wati): Add WhatsApp opt-in verification and employee onboarding guide

feat(wati): Enhance token handling and error logging for WATI API integration

fix(wati_service): Update OTP template parameter names to numeric placeholders

docs: Consolidate OTP documentation and clean up test files

docs: Add OTP cache fallback implementation and WATI troubleshooting guides

fix(wati_service): Add validation for missing access token and deployment configuration

chore: Consolidate documentation and integrate WATI WhatsApp OTP service

feat(customer_auth): Extract customer token logic into dedicated service

updates

fix(customer_auth): Replace random OTP generation with hardcoded value for testing

feat(customer_auth): Add mobile number normalization for OTP operations

fix(customer_auth): Refactor SystemUserService initialization and token verification

feat(customer_auth): Implement OTP-based customer authentication system