feat: Implement core monetization features including course pricing, payment preference creation, and transaction management with Mercado Pago integration.

services/lms-service/migrations/20260215000000_monetization.sql

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+-- Add price and currency to courses table in LMS
+ALTER TABLE courses ADD COLUMN price NUMERIC(10, 2) DEFAULT 0.00;
+ALTER TABLE courses ADD COLUMN currency VARCHAR(10) DEFAULT 'USD';
+
+-- Create transactions table
+CREATE TABLE transactions (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    organization_id UUID NOT NULL REFERENCES organizations(id),
+    user_id UUID NOT NULL REFERENCES users(id),
+    course_id UUID NOT NULL REFERENCES courses(id),
+    amount NUMERIC(10, 2) NOT NULL,
+    currency VARCHAR(10) NOT NULL,
+    status TEXT NOT NULL DEFAULT 'pending', -- 'pending', 'success', 'failure'
+    provider_reference TEXT,
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
+);
+
+-- Trigger for updated_at in transactions
+CREATE TRIGGER set_timestamp_transactions
+BEFORE UPDATE ON transactions
+FOR EACH ROW
+EXECUTE PROCEDURE trigger_set_timestamp();