Fix category mapping and TotalTrades drift, plan traits/tiering (Teil D)

- MarketCategoryMapper: classify from question text (the Gamma /markets
  endpoint delivers neither category nor event tags, so on-demand markets
  had no signal at all), match short tokens on word boundaries ("eth" no
  longer hits inside "whether", "pop" not inside "popular"), widen the
  keyword lists across all categories.
- UpdateMarketFields: never overwrite a tag-derived category with an
  uninformative "Other" from the on-demand path.
- PositionPnLEngine: sync Trader.TotalTrades to the actual replayed row
  count — the worker-side increment counters drift (INSERT IGNORE,
  deletions, historic imports) and produced Trades30d > TotalTrades.
- Tests: 14 new (mapper classification + word-boundary regression,
  TotalTrades sync + Trades30d invariant, category update guard via
  SQLite) — suite now 32 green + 1 skip.
- FIXPLAN Teil D for the larger rebuilds (AggregatedCount column,
  TraderTraits heuristics, IngestMode tiering for ultra-HF traders).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/Predictalytics.Infrastructure/Providers/Polymarket/PolymarketProvider.cs

@@ -318,7 +318,7 @@ public class PolymarketProvider : IPlatformProvider
     {
         long.TryParse(raw.Id, out var marketNumericId);
 
-        var catMap = Predictalytics.Infrastructure.Helpers.MarketCategoryMapper.Map(raw.Category ?? "", parentTags);
+        var catMap = Predictalytics.Infrastructure.Helpers.MarketCategoryMapper.Map(raw.Category ?? "", parentTags, raw.Question ?? "");
 
         var market = new Market
         {