feat: Implement comprehensive course analytics, RBAC with roles and authentication, and dynamic passing thresholds.

services/lms-service/migrations/20231222000002_add_roles.sql

@@ -0,0 +1,5 @@
+-- Add role column to users table for RBAC sync
+ALTER TABLE users ADD COLUMN IF NOT EXISTS role TEXT NOT NULL DEFAULT 'student';
+
+-- Add check constraint
+ALTER TABLE users ADD CONSTRAINT check_valid_role CHECK (role IN ('admin', 'instructor', 'student'));