v6.1.0 — Migration System + Admin Improvements

Features

• Migration system redesigned as job-based architecture
• MIGRATION.md system design document
• YouTube channel video extraction for sermon migration
• Rule-based content classifier
• Modular appliers: images, settings, posts, config, pages
• Profile page: email editable, super_admin role label
• Super admin bootstrap endpoint

Fixes

• Dynamic blocks show placeholder instead of null when empty
• Profile route accessible by super admin
• Migration routes auth scope fixed
• Prisma prepared statement compatibility

Notes

• Migration UI hidden from menu (on hold)
• Backend code ready for future activation