fix(deploy): resolve Docker startup and CSRF issues

- Rename TASKPLANER_DATA_DIR to DATA_DIR (avoid adapter-node envPrefix conflict)
- Add TASKPLANER_ORIGIN for CSRF protection in docker-compose.yml
- Add automatic database schema initialization on startup
- Add Playwright E2E tests for Docker deployment verification
- Update .env.example with correct variable names

Fixes container restart loop and 403 errors on form submission.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

package.json

@@ -13,9 +13,12 @@
 		"db:generate": "drizzle-kit generate",
 		"db:migrate": "drizzle-kit migrate",
 		"db:push": "drizzle-kit push",
-		"db:studio": "drizzle-kit studio"
+		"db:studio": "drizzle-kit studio",
+		"test:e2e": "playwright test",
+		"test:e2e:docker": "BASE_URL=http://localhost:3000 playwright test tests/docker-deployment.spec.ts"
 	},
 	"devDependencies": {
+		"@playwright/test": "^1.58.1",
 		"@sveltejs/adapter-auto": "^7.0.0",
 		"@sveltejs/adapter-node": "^5.5.2",
 		"@sveltejs/kit": "^2.50.1",