zephyrdark efcfc0e090 feat: add E2E tests for backend and frontend
Backend (pytest):
- Auth flow tests (login, token, protected routes)
- Portfolio CRUD and transaction tests
- Strategy endpoint tests
- Backtest flow tests
- Snapshot and returns tests

Frontend (Playwright):
- Auth page tests
- Portfolio navigation tests
- Strategy page tests
- Backtest page tests
- Playwright configuration

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
2026-02-03 12:30:13 +09:00
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