feat(infra): implement batch transformation layer and comprehensive documentation

Add batch ETL pipeline with ODS→DDS→DM transformation jobs and scripts.
Create DDL infrastructure with automated database schema application.
Update Makefile with transform target for executing batch processes.
Rewrite README with complete Russian documentation including architecture
diagrams, quick start guide, and data flow visualization.

ddl/00_databases.sql

@@ -0,0 +1,5 @@
+-- Databases for layered DWH
+CREATE DATABASE IF NOT EXISTS stg;
+CREATE DATABASE IF NOT EXISTS ods;
+CREATE DATABASE IF NOT EXISTS dds;
+CREATE DATABASE IF NOT EXISTS dm;