Add backend unit/integration tests, Playwright e2e tests, README, cookie Secure fix

backend/tests/integration/setup/env.setup.ts

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+// Runs before the test framework loads, so app.ts's Postgres pool (created
+// at import time) connects to the disposable test database instead of
+// whatever PGHOST/PGUSER happen to be set in the shell environment.
+process.env.NODE_ENV = 'test';
+process.env.PGHOST = process.env.TEST_PGHOST || 'localhost';
+process.env.PGPORT = process.env.TEST_PGPORT || '55432';
+process.env.PGUSER = process.env.TEST_PGUSER || 'redefined_test';
+process.env.PGPASSWORD = process.env.TEST_PGPASSWORD || 'redefined_test';
+process.env.PGDATABASE = process.env.TEST_PGDATABASE || 'redefined_test';
+process.env.DEMO_MODE = 'true';
+process.env.UPLOADS_DIR = '/tmp/redefined-test-uploads';

backend/tests/integration/setup/globalSetup.ts

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+import { Client } from 'pg';
+
+async function waitForDb(retries = 20): Promise<void> {
+  const config = {
+    host: process.env.TEST_PGHOST || 'localhost',
+    port: parseInt(process.env.TEST_PGPORT || '55432', 10),
+    user: process.env.TEST_PGUSER || 'redefined_test',
+    password: process.env.TEST_PGPASSWORD || 'redefined_test',
+    database: process.env.TEST_PGDATABASE || 'redefined_test'
+  };
+  for (let i = 0; i < retries; i++) {
+    const client = new Client(config);
+    try {
+      await client.connect();
+      await client.end();
+      return;
+    } catch {
+      await new Promise(r => setTimeout(r, 1000));
+    }
+  }
+  throw new Error(
+    'Could not reach the test database on port 55432. Run `npm run db:test:up` before `npm run test:integration`.'
+  );
+}
+
+export default async function globalSetup(): Promise<void> {
+  await waitForDb();
+  const { migrate, closeDb } = await import('./testDb');
+  await migrate();
+  await closeDb();
+}

backend/tests/integration/setup/testDb.ts

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+import { Pool } from 'pg';
+import fs from 'fs';
+import path from 'path';
+
+export const testPool = new Pool({
+  host: process.env.TEST_PGHOST || 'localhost',
+  port: parseInt(process.env.TEST_PGPORT || '55432', 10),
+  user: process.env.TEST_PGUSER || 'redefined_test',
+  password: process.env.TEST_PGPASSWORD || 'redefined_test',
+  database: process.env.TEST_PGDATABASE || 'redefined_test'
+});
+
+export async function migrate(): Promise<void> {
+  const sql = fs.readFileSync(path.join(__dirname, '..', '..', '..', 'init.sql'), 'utf-8');
+  await testPool.query(sql);
+}
+
+export async function resetDb(): Promise<void> {
+  await testPool.query(`
+    TRUNCATE TABLE orders, customer_tokens, customer_sessions, customers, item_images, items
+    RESTART IDENTITY CASCADE
+  `);
+}
+
+export async function closeDb(): Promise<void> {
+  await testPool.end();
+}