feat: add Playwright E2E and API regression test suite

Production-ready test infrastructure with Page Object Model pattern,
reusable fixtures for auth/DB/test-data, and example tests covering
login flow, dashboard, accounts CRUD API, and visual regression.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

package.json

@@ -0,0 +1,24 @@
+{
+  "name": "hoa-ledgeriq-tests",
+  "version": "1.0.0",
+  "private": true,
+  "description": "Root package for Playwright E2E & API tests",
+  "scripts": {
+    "test:e2e": "npx playwright test",
+    "test:e2e:chromium": "npx playwright test --project=chromium",
+    "test:e2e:firefox": "npx playwright test --project=firefox",
+    "test:e2e:webkit": "npx playwright test --project=webkit",
+    "test:e2e:api": "npx playwright test --project=api",
+    "test:e2e:headed": "npx playwright test --headed",
+    "test:e2e:debug": "npx playwright test --debug",
+    "test:e2e:ui": "npx playwright test --ui",
+    "test:e2e:report": "npx playwright show-report",
+    "test:e2e:update-snapshots": "npx playwright test --update-snapshots"
+  },
+  "devDependencies": {
+    "@playwright/test": "^1.49.0",
+    "dotenv": "^16.4.0",
+    "pg": "^8.13.0",
+    "@types/pg": "^8.11.0"
+  }
+}