feat: Implement multi-tenancy with new database migrations, API updates across services, and refactor frontend API calls.

services/lms-service/migrations/20250116100000_add_multi_tenancy.sql

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+-- Migration: Add Multi-Tenancy Support (LMS)
+-- Based on existing schema: users, courses, enrollments
+
+-- 1. Create organizations table (Mirrors CMS structure)
+CREATE TABLE organizations (
+    id UUID PRIMARY KEY, -- ID synced from CMS
+    name VARCHAR(255) NOT NULL,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+-- 2. Create default organization
+INSERT INTO organizations (id, name) VALUES ('00000000-0000-0000-0000-000000000001', 'Default Organization');
+
+-- 3. Add organization_id to tables
+ALTER TABLE users ADD COLUMN organization_id UUID NOT NULL DEFAULT '00000000-0000-0000-0000-000000000001';
+ALTER TABLE courses ADD COLUMN organization_id UUID NOT NULL DEFAULT '00000000-0000-0000-0000-000000000001';
+ALTER TABLE enrollments ADD COLUMN organization_id UUID NOT NULL DEFAULT '00000000-0000-0000-0000-000000000001';
+
+-- 4. Add Foreign Keys
+ALTER TABLE users ADD CONSTRAINT fk_user_organization FOREIGN KEY (organization_id) REFERENCES organizations(id) ON DELETE CASCADE;
+ALTER TABLE courses ADD CONSTRAINT fk_course_organization FOREIGN KEY (organization_id) REFERENCES organizations(id) ON DELETE CASCADE;
+ALTER TABLE enrollments ADD CONSTRAINT fk_enrollment_organization FOREIGN KEY (organization_id) REFERENCES organizations(id) ON DELETE CASCADE;
+
+-- 5. Remove default values
+ALTER TABLE users ALTER COLUMN organization_id DROP DEFAULT;
+ALTER TABLE courses ALTER COLUMN organization_id DROP DEFAULT;
+ALTER TABLE enrollments ALTER COLUMN organization_id DROP DEFAULT;
+
+-- 6. Update Unique Constraints for Users
+-- Drop global unique email constraint
+ALTER TABLE users DROP CONSTRAINT IF EXISTS users_email_key;
+
+-- Add composite unique index
+CREATE UNIQUE INDEX users_organization_id_email_idx ON users (organization_id, lower(email));