feat: роли customer/admin, админ-панель, admin@site.com

Co-authored-by: Cursor <cursoragent@cursor.com>

postgres/init/01_schema.sql

@@ -5,9 +5,13 @@ CREATE TABLE IF NOT EXISTS users (
   email TEXT NOT NULL UNIQUE,
   password_hash TEXT NOT NULL,
   name TEXT NOT NULL,
+  role TEXT NOT NULL DEFAULT 'customer'
+    CHECK (role IN ('customer', 'admin')),
   created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
 );
 
+CREATE INDEX IF NOT EXISTS idx_users_role ON users(role);
+
 CREATE TABLE IF NOT EXISTS categories (
   id SERIAL PRIMARY KEY,
   slug TEXT NOT NULL UNIQUE,

postgres/init/02_roles.sql

@@ -0,0 +1,14 @@
+-- Роли пользователей (миграция для существующих БД)
+ALTER TABLE users ADD COLUMN IF NOT EXISTS role TEXT NOT NULL DEFAULT 'customer';
+
+DO $$
+BEGIN
+  IF NOT EXISTS (
+    SELECT 1 FROM pg_constraint WHERE conname = 'users_role_check'
+  ) THEN
+    ALTER TABLE users ADD CONSTRAINT users_role_check
+      CHECK (role IN ('customer', 'admin'));
+  END IF;
+END $$;
+
+CREATE INDEX IF NOT EXISTS idx_users_role ON users(role);