Controller was directly calling personRepository.save() for person creation.
Extracted into PersonService.createPerson() to enforce Controller → Service → Repository layering.
Also documented the layering rules in CLAUDE.md.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Missing closing braces caused Spring to inject the literal placeholder
string instead of resolving the property, silently ignoring any
app.admin.username / app.admin.password env-var overrides.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>