Lukas 9242b4709a Add GET /api/dashboard/bans/trend endpoint ...

Implement time-bucketed ban aggregation for dashboard trend charts:

- Add BanTrendBucket / BanTrendResponse Pydantic models and
  BUCKET_SECONDS / BUCKET_SIZE_LABEL / bucket_count helpers to ban.py
- Add ban_service.ban_trend(): queries fail2ban DB with SQL bucket
  grouping, fills zero-count buckets, respects origin filter
- Add GET /api/dashboard/bans/trend route in dashboard.py
- 20 new tests (10 service, 10 router); 480 total pass, 83% coverage
- ruff + mypy --strict clean

2026-03-11 16:38:19 +01:00

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