feat: update CMS service handlers and main application logic.

services/cms-service/migrations/20231219000003_users_table.sql

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+-- Create users table for Instructors
+CREATE TABLE IF NOT EXISTS users (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    email TEXT UNIQUE NOT NULL,
+    password_hash TEXT NOT NULL,
+    full_name TEXT NOT NULL,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+-- Add instructor_id foreign key constraint to courses if not already applied
+-- (In the initial schema it was just a UUID, let's make it formal if possible)
+-- ALTER TABLE courses ADD CONSTRAINT fk_instructor FOREIGN KEY (instructor_id) REFERENCES users(id);

services/cms-service/migrations/20231221000001_grading_system.sql

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+-- Add grading categories table
+CREATE TABLE grading_categories (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    course_id UUID NOT NULL REFERENCES courses(id) ON DELETE CASCADE,
+    name TEXT NOT NULL,
+    weight INTEGER NOT NULL CHECK (weight >= 0 AND weight <= 100),
+    drop_count INTEGER NOT NULL DEFAULT 0,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
+
+-- Update lessons with grading fields
+ALTER TABLE lessons ADD COLUMN grading_category_id UUID REFERENCES grading_categories(id) ON DELETE SET NULL;
+ALTER TABLE lessons ADD COLUMN is_graded BOOLEAN NOT NULL DEFAULT FALSE;