fix(predictions): move prediction-tags.json into scripts/data/ for Railway (#1518)

Railway deploys with rootDirectory=scripts/, so ../shared/ resolves to
/shared/ which doesn't exist. Move the canonical file to scripts/data/
and update all four consumers.

shared/prediction-tags.json

@@ -1,24 +0,0 @@
-{
-  "geopolitical": [
-    "politics", "geopolitics", "elections", "world",
-    "ukraine", "china", "middle-east", "europe",
-    "economy", "fed", "inflation"
-  ],
-  "tech": [
-    "ai", "tech", "crypto", "science",
-    "elon-musk", "business", "economy"
-  ],
-  "finance": [
-    "economy", "fed", "inflation", "interest-rates", "recession",
-    "trade", "tariffs", "debt-ceiling",
-    "crypto", "business", "markets"
-  ],
-  "excludeKeywords": [
-    "nba", "nfl", "mlb", "nhl", "fifa", "world cup", "super bowl", "championship",
-    "playoffs", "oscar", "grammy", "emmy", "box office", "movie", "album", "song",
-    "streamer", "influencer", "celebrity", "kardashian",
-    "bachelor", "reality tv", "mvp", "touchdown", "home run", "goal scorer",
-    "academy award", "bafta", "golden globe", "cannes", "sundance",
-    "documentary", "feature film", "tv series", "season finale"
-  ]
-}