feat: backend auth, admin panel, role-based routing

db/init/init.sql

@@ -0,0 +1,13 @@
+CREATE EXTENSION IF NOT EXISTS pgcrypto;
+
+CREATE TABLE IF NOT EXISTS users (
+    id BIGSERIAL PRIMARY KEY,
+    username VARCHAR(50) UNIQUE NOT NULL,
+    password VARCHAR(255) NOT NULL,
+    role VARCHAR(20) NOT NULL DEFAULT 'STUDENT'
+);
+
+-- Админ по умолчанию: admin / admin (bcrypt через pgcrypto)
+INSERT INTO users (username, password, role)
+VALUES ('admin', crypt('admin', gen_salt('bf', 10)), 'ADMIN')
+ON CONFLICT (username) DO NOTHING;