Rebuilt embed-example.html with inline, full-screen, and popup examples.
Fixed host-page/frame scrolling and contained reply navigation.
New logins now transactionally replace prior sessions; displaced clients
return to login.
Added per-user session/IP locking with automatic SQLite migration.
Added modular Spam Control dashboard for locks, honeypot, and CAPTCHA
settings.
Moved CAPTCHA controls out of Plans & Platform.