Add popularity score for EV-optimized number selection

Adds _calculate_popularity_score() which favors number combinations
unlikely to be picked by other players (numbers > 31, no consecutive
sequences, avoiding common "lucky numbers"). This doesn't improve hit
probability (lottery draws are i.i.d. random) but increases expected
value by reducing the chance of sharing a jackpot.

- New 20% weight in quality score
- New Popularity_Score column in tip CSV export

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

data/generated_tips/generation_history.json

@@ -440,6 +440,13 @@
       "file": "weekly_lotto_tips_20260610_123055.csv",
       "avg_confidence": 0.5643409470927386,
       "avg_quality": 0.7014208121760903
+    },
+    {
+      "timestamp": "2026-06-10T13:32:43.029205",
+      "num_tips": 10,
+      "file": "weekly_lotto_tips_20260610_133243.csv",
+      "avg_confidence": 0.5643409470927386,
+      "avg_quality": 0.6788503626336448
     }
   ]
 }