feat: завершён этап 1 - Фундамент Core Service

- Удалены зависимости: grpc, redis, prometheus
- Упрощена конфигурация (Server, Database, JWT)
- Создан логгер на основе logrus
- Добавлено подключение к PostgreSQL
- Создана миграция с базовыми таблицами
- Обновлены модели с валидацией
- Создан базовый API сервер с health check
- Добавлен .env.example

Готово для этапа 2 - Аутентификация

core-service/migrations/001_initial_schema.sql

@@ -0,0 +1,72 @@
+-- Initial schema for ERP MVP
+-- Migration: 001_initial_schema.sql
+
+-- Enable UUID extension
+CREATE EXTENSION IF NOT EXISTS "uuid-ossp";
+
+-- Organizations table
+CREATE TABLE organizations (
+    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+    name VARCHAR(255) NOT NULL,
+    type VARCHAR(100),
+    settings JSONB,
+    created_at TIMESTAMP DEFAULT NOW()
+);
+
+-- Users table
+CREATE TABLE users (
+    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+    organization_id UUID REFERENCES organizations(id) ON DELETE CASCADE,
+    email VARCHAR(255) UNIQUE NOT NULL,
+    password_hash VARCHAR(255) NOT NULL,
+    role VARCHAR(50) DEFAULT 'user',
+    created_at TIMESTAMP DEFAULT NOW()
+);
+
+-- Storage locations table
+CREATE TABLE storage_locations (
+    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+    organization_id UUID REFERENCES organizations(id) ON DELETE CASCADE,
+    parent_id UUID REFERENCES storage_locations(id) ON DELETE CASCADE,
+    name VARCHAR(255) NOT NULL,
+    address VARCHAR(100) NOT NULL,
+    type VARCHAR(50) NOT NULL,
+    coordinates JSONB,
+    created_at TIMESTAMP DEFAULT NOW()
+);
+
+-- Items table
+CREATE TABLE items (
+    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+    organization_id UUID REFERENCES organizations(id) ON DELETE CASCADE,
+    name VARCHAR(255) NOT NULL,
+    description TEXT,
+    category VARCHAR(100),
+    created_at TIMESTAMP DEFAULT NOW()
+);
+
+-- Item placements table
+CREATE TABLE item_placements (
+    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+    organization_id UUID REFERENCES organizations(id) ON DELETE CASCADE,
+    item_id UUID REFERENCES items(id) ON DELETE CASCADE,
+    location_id UUID REFERENCES storage_locations(id) ON DELETE CASCADE,
+    quantity INTEGER DEFAULT 1,
+    created_at TIMESTAMP DEFAULT NOW()
+);
+
+-- Indexes for better performance
+CREATE INDEX idx_users_organization_id ON users(organization_id);
+CREATE INDEX idx_users_email ON users(email);
+CREATE INDEX idx_storage_locations_organization_id ON storage_locations(organization_id);
+CREATE INDEX idx_storage_locations_parent_id ON storage_locations(parent_id);
+CREATE INDEX idx_storage_locations_address ON storage_locations(address);
+CREATE INDEX idx_items_organization_id ON items(organization_id);
+CREATE INDEX idx_items_name ON items(name);
+CREATE INDEX idx_items_category ON items(category);
+CREATE INDEX idx_item_placements_organization_id ON item_placements(organization_id);
+CREATE INDEX idx_item_placements_item_id ON item_placements(item_id);
+CREATE INDEX idx_item_placements_location_id ON item_placements(location_id);
+
+-- Unique constraints
+CREATE UNIQUE INDEX idx_storage_locations_org_address ON storage_locations(organization_id, address);