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>

docker-compose.yml

@@ -8,7 +8,8 @@ services:
       - taskplaner_data:/app/data
     environment:
       - NODE_ENV=production
-      - TASKPLANER_DATA_DIR=/app/data
+      - DATA_DIR=/app/data
+      - TASKPLANER_ORIGIN=http://localhost:3000
     restart: unless-stopped
 
 volumes: