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>

scripts/automation/auto_update_and_learn.py

@@ -27,6 +27,7 @@ project_dir = os.path.dirname(os.path.dirname(script_dir))
 sys.path.insert(0, project_dir)
 
 from scripts.utils.update_from_api import EurojackpotAPIUpdater
+from scripts.utils.update_from_eurojackpot_zahlen_eu import EurojackpotUpdater as WebScraper
 from scripts.generators.ultimate_ai_ml_eurojackpot_generator import UltimateAIMLEurojackpotGenerator
 from scripts.utils.notifier import EurojackpotNotifier
 
@@ -129,7 +130,16 @@ class AutoUpdateAndLearn:
             if success:
                 print("   ✅ Daten erfolgreich aktualisiert")
             else:
-                print("   ⚠️  Update ohne neue Daten")
+                print("   ⚠️  API-Update ohne neue Daten, versuche Web-Scraper...")
+                try:
+                    scraper = WebScraper(self.data_file)
+                    success = scraper.update(create_backup=False)
+                    if success:
+                        print("   ✅ Web-Scraper erfolgreich")
+                    else:
+                        print("   ⚠️  Web-Scraper ohne neue Daten")
+                except Exception as scrape_err:
+                    print(f"   ❌ Web-Scraper Fehler: {scrape_err}")
 
             return success