Improve generator quality and fix data gaps (Apr-May 2026)

Data:
- Add 12 missing draws (2026-01-09, 2026-04-03 to 2026-05-15)
- Retrain LSTM and RF models on complete 952-draw dataset
- Run retroactive learning for all 12 skipped draws

Automation:
- Add eurojackpot-zahlen.eu web scraper as fallback when APIs fail
- Fixes recurring gap problem caused by Sazka detail-endpoint change

Generator improvements:
- Add hard structural filters (sum 95-165, min 1 even + 1 odd per tip)
- Add long-term frequency prior as learner dampener (alpha=0.2)
- Fix ENSEMBLE strategy generating duplicate tips (greedy → weighted random)
- Fix non-vectorized frequency calculation (stack().value_counts())
- Fix Division-by-Zero edge case in set_frequency_prior
- Fix potential KeyError on euro_ai_score in structural filter loop

.gitignore:
- Exclude data/backups/, weekly tip CSVs, performance reports

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

data/eurojackpot_ml_models/deep_learning_euro/lstm_config_12.json

@@ -1,9 +1,9 @@
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 }

data/eurojackpot_ml_models/deep_learning_main/lstm_config_50.json

@@ -1,9 +1,9 @@
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 }

data/eurojackpot_ml_models/learning_state.json

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