- Remove duplicate departments/designations/employees handlers from users service (already in employees service)
- Fix all 9 profession admin handlers to use correct DB schema (display_name, bio, location, custom_data)
- Fix companies admin handler to match CompanyProfile DB model with all fields
- Fix customers admin handler to match Requirement model with preferred_date
- Fix missing serde_json imports and type annotations in admin handlers
- Add #[allow(dead_code)] for intentionally unused structs/fields
- Add test infrastructure: auth crypto tests (2 passing), test directory structure
- Zero compilation warnings across all services
