feat: Implement user profile management, add multi-language interactive transcripts, and lay groundwork for SSO.

services/lms-service/migrations/20260117000000_add_profile_fields.sql

@@ -0,0 +1,5 @@
+-- Add profile fields to users table
+ALTER TABLE users 
+ADD COLUMN IF NOT EXISTS avatar_url TEXT,
+ADD COLUMN IF NOT EXISTS bio TEXT,
+ADD COLUMN IF NOT EXISTS language VARCHAR(10);