#8 Issue 8: [Integration] Issue Verifiable Credential (SBT)

[elizabetheonoja-art]

Description:
When a course is done, mint a Soulbound Token (SBT) to the user's wallet as proof of skill.

Acceptance Criteria:

[ ] Listen for CourseCompleted event.

[ ] Call SBT Contract mint function via backend wallet.

[ ] Metadata: Course Name, Date, Grade.

Priority: High
Labels: blockchain, identity