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

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

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+-- 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'));

services/lms-service/migrations/20231222000003_add_passing_percentage.sql

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+-- Add passing_percentage to courses (synced from CMS)
+ALTER TABLE courses ADD COLUMN IF NOT EXISTS passing_percentage INTEGER NOT NULL DEFAULT 70;
+
+-- Ensure valid range
+ALTER TABLE courses ADD CONSTRAINT check_passing_percentage CHECK (passing_percentage >= 0 AND passing_percentage <= 100);