Add Aiwa Amiya organization and course records

[yusufsalam]

Summary

• add data/com/aiwa-amiya/organization.jsonld
• add data/com/aiwa-amiya/courses.jsonld
• register both Aiwa Amiya entity IDs in index.jsonld

Notes

• records are now KG-first and centered on the canonical course entity Yalla Levantine: Self-Paced Mastery
• the older public label Aiwa Amiya — Levantine Arabic for Beginners is preserved as an alternateName for continuity
• the official site schema still needs reciprocal sameAs links back to these registry records once merged
• the public website will need to align its visible product copy and page structure to this graph