Split 7 files exceeding the 500 LOC hard cap into 16 files, all under 500 LOC.
No exported symbols renamed; zero behavior changes.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Go handlers, models, stores and migrations for all SDK modules.
Updates developer portal navigation and BYOEH page.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>