feature/add secure context warning

[codebude]

• Add secure context checks to barcode scanner
• Add notes on secure context and camera usage to the docs

[github-actions]

🧪 Test Results — 5bd3016

✅ Backend (pytest) — 998 passed, 0 failed, 0 skipped (998 total)
✅ CLI (pytest) — 54 passed, 0 failed, 0 skipped (54 total)
❌ Frontend (vitest) — 451 passed, 2 failed, 0 skipped (453 total)
✅ E2E (Playwright) — 75 passed, 0 failed, 0 skipped (75 total)

Summary: 1578 ✅ passed, 2 ❌ failed (1580 total)

[github-actions]

🧪 Test Results — e828378

✅ Backend (pytest) — 998 passed, 0 failed, 0 skipped (998 total)
✅ CLI (pytest) — 54 passed, 0 failed, 0 skipped (54 total)
✅ Frontend (vitest) — 453 passed, 0 failed, 0 skipped (453 total)
✅ E2E (Playwright) — 75 passed, 0 failed, 0 skipped (75 total)

Summary: ✅ All 1580 tests passed